{"id":368,"date":"2020-12-05T02:58:12","date_gmt":"2020-12-04T18:58:12","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=368"},"modified":"2020-12-10T14:23:59","modified_gmt":"2020-12-10T06:23:59","slug":"mysql%e5%ad%a6%e4%b9%a0%e4%b8%8e%e5%ae%9e%e9%aa%8c%ef%bc%88%e4%b8%89%ef%bc%89-%e6%95%b0%e6%8d%ae%e6%9f%a5%e8%af%a2%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/experiment\/mysqlexperiment\/368.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e09\uff09\u2014\u2014\u6570\u636e\u67e5\u8be2\u5b9e\u9a8c"},"content":{"rendered":"\n<h2>3 \u6570\u636e\u67e5\u8be2\u5b9e\u9a8c<\/h2>\n\n\n\n<h3>3.1\u5355\u8868\u67e5\u8be2<\/h3>\n\n\n\n<h4>3.1.1Select \u8bed\u53e5\uff0cSQL\u6838\u5fc3\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT &#91;ALL | DISTINCT | DISTINCTROW ]&#91;HIGH_PRIORITY]\u2026 \n\u5217\u540d\u8868\u8fbe\u5f0f \u2026\n&#91;FROM  table_reference ... ]        \/*FROM\u5b50\u53e5*\/\n&#91;WHERE \u6761\u4ef6]                   \/*WHERE\u5b50\u53e5*\/\n&#91;GROUP BY {\u5217\u540d| \u8868\u8fbe\u5f0f | position} &#91;ASC | DESC], ... &#91;WITH ROLLUP]]         \/*GROUP BY\u5b50\u53e5*\/    &#91;HAVING \u6761\u4ef6]               \/*HAVING \u5b50\u53e5*\/\n&#91;ORDER BY {\u5217\u540d | \u8868\u8fbe\u5f0f | position} &#91;ASC | DESC] , ...]        \/*ORDER BY\u5b50\u53e5*\/\n&#91;LIMIT {&#91;offset,] row_count|row_count OFFSET offset}]; \/*LIMIT\u5b50\u53e5*\/<\/code><\/pre>\n\n\n\n<p><strong>SQL\u5173\u952e\u5b57\u7684\u6267\u884c\u987a\u5e8f\uff1a<\/strong><\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p><strong>from xx join xx on ------where ------ \u5b9a\u4e49\u522b\u540d- ------ group by(group by \u4e2d\u4e0d\u80fd\u7528\u805a\u5408\u51fd\u6570) ------having\uff08having \u53ef\u4ee5\u4f7f\u7528\u805a\u5408\u51fd\u6570 &amp; \u522b\u540d\uff09 ------select distinct-----order by --limit<\/strong><\/p><\/blockquote>\n\n\n\n<h4>3.1.2\u67e5\u8be2\u6240\u6709employee\u7684\u6570\u636e<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024311850.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024311850.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.1.3\u901a\u8fc7where\u6761\u4ef6\u67e5\u8be2<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024409135.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024409135.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024409130.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024409130.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.1.4\u901a\u8fc7where\u591a\u6761\u4ef6\u67e5\u8be2<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024505602.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024505602.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024505571.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024505571.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.1.5\u805a\u5408\u51fd\u6570<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120502453210.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120502453210.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.5.1\u7edf\u8ba1\u6240\u6709\u884c\u6570<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024608854.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024608854.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024608856.jpg\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024608856.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.5.2\u67e5\u627e\u6240\u6709\u5458\u5de5\u4e2d\u5de5\u4f5c\u65f6\u95f4\u6700\u957f\u7684\u5e74\u6570\uff1a<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024631576.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024631576.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.5.3\u67e5\u627e\u6240\u6709\u5458\u5de5\u4e2d\u5de5\u4f5c\u65f6\u95f4\u6700\u77ed\u7684\u5e74\u6570\uff1a<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024702635.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024702635.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.5.4\u7edf\u8ba1\u6240\u6709\u5458\u5de5\u5de5\u4f5c\u5e74\u957f\u603b\u548c<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024731261.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024731261.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h6>1.3.1.5.5\u7edf\u8ba1\u5458\u5de5\u7684\u5e73\u5747\u5de5\u4f5c\u5e74\u957f<\/h6>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024800812.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024800812.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.1.6\u5206\u7ec4\u7edf\u8ba1\u67e5\u8be2<\/h4>\n\n\n\n<p>\u4f7f\u7528 GROUP BY \u5173\u952e\u5b57\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>GROUP BY  &lt;\u5b57\u6bb5\u540d><\/code><\/pre>\n\n\n\n<p>\u5176\u4e2d\uff0c\u201c\u5b57\u6bb5\u540d\u201d\u8868\u793a\u9700\u8981\u5206\u7ec4\u7684\u5b57\u6bb5\u540d\u79f0\uff0c\u591a\u4e2a\u5b57\u6bb5\u65f6\u7528\u9017\u53f7\u9694\u5f00\u3002<\/p>\n\n\n\n<h5>3.1.6.1\u6309\u7167workYear\u5206\u7ec4\u67e5\u8be2<\/h5>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024823174.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>GROUP BY\u5355\u72ec\u4f7f\u7528 GROUP BY \u5173\u952e\u5b57\u65f6\uff0c\u67e5\u8be2\u7ed3\u679c\u4f1a\u53ea\u663e\u793a\u6bcf\u4e2a\u5206\u7ec4\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\u3002<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024823174.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>GROUP BY\u5355\u72ec\u4f7f\u7528 GROUP BY \u5173\u952e\u5b57\u65f6\uff0c\u67e5\u8be2\u7ed3\u679c\u4f1a\u53ea\u663e\u793a\u6bcf\u4e2a\u5206\u7ec4\u7684\u7b2c\u4e00\u6761\u8bb0\u5f55\u3002<\/p><\/noscript>\n\n\n\n<h5>3.1.6.2\u6309\u7167workYear\u5206\u7ec4\u5e76\u7edf\u8ba1\u6bcf\u7ec4\u7684\u8bb0\u5f55\u6570<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024851335.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024851335.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.6.3GROUP BY \u5173\u952e\u5b57\u53ef\u4ee5\u548c GROUP_CONCAT() \u51fd\u6570\u4e00\u8d77\u4f7f\u7528\u3002GROUP_CONCAT() \u51fd\u6570\u4f1a\u628a\u6bcf\u4e2a\u5206\u7ec4\u7684\u5b57\u6bb5\u503c\u90fd\u663e\u793a\u51fa\u6765\u3002<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024912204.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024912204.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.1.7ORDER BY \u5173\u952e\u5b57\u4e3b\u8981\u7528\u6765\u5c06\u67e5\u8be2\u7ed3\u679c\u4e2d\u7684\u6570\u636e\u6309\u7167\u4e00\u5b9a\u7684\u987a\u5e8f\u8fdb\u884c\u6392\u5e8f\u3002<\/h4>\n\n\n\n<p><strong><em>*\u5176\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a*<\/em><\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>ORDER BY &lt;\u5b57\u6bb5\u540d> &#91;ASC|DESC]\n\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\u3002<\/code><\/pre>\n\n\n\n<p>\u5b57\u6bb5\u540d\uff1a\u8868\u793a\u9700\u8981\u6392\u5e8f\u7684\u5b57\u6bb5\u540d\u79f0\uff0c\u591a\u4e2a\u5b57\u6bb5\u65f6\u7528\u9017\u53f7\u9694\u5f00\u3002<\/p>\n\n\n\n<p>ASC|DESC\uff1aASC\u8868\u793a\u5b57\u6bb5\u6309\u5347\u5e8f\u6392\u5e8f\uff1bDESC\u8868\u793a\u5b57\u6bb5\u6309\u964d\u5e8f\u6392\u5e8f\u3002\u5176\u4e2dASC\u4e3a\u9ed8\u8ba4\u503c\u3002<\/p>\n\n\n\n<p>\u4f7f\u7528 ORDER BY \u5173\u952e\u5b57\u5e94\u8be5\u6ce8\u610f\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\uff1a<\/p>\n\n\n\n<p>ORDER BY \u5173\u952e\u5b57\u540e\u53ef\u4ee5\u8ddf\u5b50\u67e5\u8be2\u3002<\/p>\n\n\n\n<p>\u5f53\u6392\u5e8f\u7684\u5b57\u6bb5\u4e2d\u5b58\u5728\u7a7a\u503c\u65f6\uff0cORDER BY \u4f1a\u5c06\u8be5\u7a7a\u503c\u4f5c\u4e3a\u6700\u5c0f\u503c\u6765\u5bf9\u5f85\u3002<\/p>\n\n\n\n<p>ORDER BY \u6307\u5b9a\u591a\u4e2a\u5b57\u6bb5\u8fdb\u884c\u6392\u5e8f\u65f6\uff0cMySQL \u4f1a\u6309\u7167\u5b57\u6bb5\u7684\u987a\u5e8f\u4ece\u5de6\u5230\u53f3\u4f9d\u6b21\u8fdb\u884c\u6392\u5e8f\u3002<\/p>\n\n\n\n<h5>3.1.7.1\u5355\u4e2a\u5b57\u6bb5\u901a\u8fc7workYear\u5347\u5e8f\u6392\u5e8f<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205024943437.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205024943437.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.7.2\u5355\u4e2a\u5b57\u6bb5\u901a\u8fc7workYear\u964d\u5e8f\u6392\u5e8f<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025030970.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025030970.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.7.3\u9996\u5148\u901a\u8fc7workYear\u5347\u5e8f\u6392\u5e8f\uff0c\u7136\u540e\u901a\u8fc7departmentID\u5347\u5e8f<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025043639.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025043639.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.1.7.4LIMIT \u662f MySQL \u4e2d\u7684\u4e00\u4e2a\u7279\u6b8a\u5173\u952e\u5b57\uff0c\u7528\u4e8e\u6307\u5b9a\u67e5\u8be2\u7ed3\u679c\u4ece\u54ea\u6761\u8bb0\u5f55\u5f00\u59cb\u663e\u793a\uff0c\u4e00\u5171\u663e\u793a\u591a\u5c11\u6761\u8bb0\u5f55\u3002<\/h5>\n\n\n\n<p>LIMIT \u5173\u952e\u5b57\u6709 3 \u79cd\u4f7f\u7528\u65b9\u5f0f\uff0c\u5373\u6307\u5b9a\u521d\u59cb\u4f4d\u7f6e\u3001\u4e0d\u6307\u5b9a\u521d\u59cb\u4f4d\u7f6e\u4ee5\u53ca\u4e0e OFFSET \u7ec4\u5408\u4f7f\u7528\u3002<\/p>\n\n\n\n<p>LIMIT \u5173\u952e\u5b57\u53ef\u4ee5\u6307\u5b9a\u67e5\u8be2\u7ed3\u679c\u4ece\u54ea\u6761\u8bb0\u5f55\u5f00\u59cb\u663e\u793a\uff0c\u663e\u793a\u591a\u5c11\u6761\u8bb0\u5f55\u3002<\/p>\n\n\n\n<p>LIMIT \u6307\u5b9a\u521d\u59cb\u4f4d\u7f6e\u7684\u57fa\u672c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<p>LIMIT \u521d\u59cb\u4f4d\u7f6e\uff0c\u8bb0\u5f55\u6570<\/p>\n\n\n\n<p>\u5176\u4e2d\uff0c\u201c\u521d\u59cb\u4f4d\u7f6e\u201d\u8868\u793a\u4ece\u54ea\u6761\u8bb0\u5f55\u5f00\u59cb\u663e\u793a\uff1b\u201c\u8bb0\u5f55\u6570\u201d\u8868\u793a\u663e\u793a\u8bb0\u5f55\u7684\u6761\u6570\u3002\u7b2c\u4e00\u6761\u8bb0\u5f55\u7684\u4f4d\u7f6e\u662f 0\uff0c\u7b2c\u4e8c\u6761\u8bb0\u5f55\u7684\u4f4d\u7f6e\u662f 1\u3002\u540e\u9762\u7684\u8bb0\u5f55\u4f9d\u6b21\u7c7b\u63a8\u3002<\/p>\n\n\n\n<p>\u6ce8\u610f\uff1aLIMIT \u540e\u7684\u4e24\u4e2a\u53c2\u6570\u5fc5\u987b\u90fd\u662f\u6b63\u6574\u6570\u3002<\/p>\n\n\n\n<p>\u663e\u793a\u67e5\u8be2\u6570\u636e\u4e2d\u7684\u524d5\u6761\u6570\u636e<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025129220.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025129220.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>\u4ece\u7b2c3\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u663e\u793a5\u6761\u6570\u636e<br><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025140191.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u4ece\u7b2c3\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u663e\u793a5\u6761\u6570\u636e<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025140191.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u4ece\u7b2c3\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u663e\u793a5\u6761\u6570\u636e<\/p><\/noscript>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025154610.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025154610.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>3.2\u591a\u8868\u67e5\u8be2<\/h3>\n\n\n\n<h4>3.2.1\u5168\u8fde\u63a5\u67e5\u8be2 employee\u548cdepartment<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025240975.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025240975.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.2\u5168\u8fde\u63a5\u6761\u4ef6\u67e5\u8be2<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025251892.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025251892.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.3\u5185\u8fde\u63a5\u4f7f\u7528 INNER JOIN \u5173\u952e\u5b57\u8fde\u63a5\u4e24\u5f20\u8868\uff0c\u5e76\u4f7f\u7528 ON \u5b50\u53e5\u6765\u8bbe\u7f6e\u8fde\u63a5\u6761\u4ef6\u3002<\/h4>\n\n\n\n<p>\u5982\u679c\u6ca1\u6709\u8fde\u63a5\u6761\u4ef6\uff0cINNER JOIN \u548c CROSS JOIN \u5728\u8bed\u6cd5\u4e0a\u662f\u7b49\u540c\u7684\uff0c\u4e24\u8005\u53ef\u4ee5\u4e92\u6362\u3002<\/p>\n\n\n\n<p>\u5185\u8fde\u63a5\u7684\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT &lt;\u5b57\u6bb5\u540d> FROM &lt;\u88681> INNER JOIN &lt;\u88682> &#91;ON\u5b50\u53e5]<\/code><\/pre>\n\n\n\n<p>\u8bed\u6cd5\u8bf4\u660e\u5982\u4e0b\u3002<\/p>\n\n\n\n<p>\u5b57\u6bb5\u540d\uff1a\u9700\u8981\u67e5\u8be2\u7684\u5b57\u6bb5\u540d\u79f0\u3002<\/p>\n\n\n\n<p>&lt;\u88681&gt;&lt;\u88682&gt;\uff1a\u9700\u8981\u5185\u8fde\u63a5\u7684\u8868\u540d\u3002<\/p>\n\n\n\n<p>INNER JOIN \uff1a\u5185\u8fde\u63a5\u4e2d\u53ef\u4ee5\u7701\u7565 INNER \u5173\u952e\u5b57\uff0c\u53ea\u7528\u5173\u952e\u5b57 JOIN\u3002<\/p>\n\n\n\n<p>ON \u5b50\u53e5\uff1a\u7528\u6765\u8bbe\u7f6e\u5185\u8fde\u63a5\u7684\u8fde\u63a5\u6761\u4ef6\u3002<\/p>\n\n\n\n<p>INNER JOIN \u4e5f\u53ef\u4ee5\u4f7f\u7528 WHERE \u5b50\u53e5\u6307\u5b9a\u8fde\u63a5\u6761\u4ef6\uff0c\u4f46\u662f INNER JOIN \u2026 ON \u8bed\u6cd5\u662f\u5b98\u65b9\u7684\u6807\u51c6\u5199\u6cd5\uff0c\u800c\u4e14 WHERE \u5b50\u53e5\u5728\u67d0\u4e9b\u65f6\u5019\u4f1a\u5f71\u54cd\u67e5\u8be2\u7684\u6027\u80fd\u3002\u591a\u4e2a\u8868\u5185\u8fde\u63a5\u65f6\uff0c\u5728 FROM \u540e\u8fde\u7eed\u4f7f\u7528 INNER JOIN \u6216 JOIN \u5373\u53ef\u3002\u5185\u8fde\u63a5\u53ef\u4ee5\u67e5\u8be2\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a\u7684\u8868\u3002<\/p>\n\n\n\n<h5>3.2.3.1\u4f7f\u7528 inner join<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025331287.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025331287.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h5>3.2.3.3\u4f7f\u7528inner join on \u67e5\u8be2<\/h5>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025345965.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025345965.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.4\u67e5\u8be2\u6bcf\u4e2a\u96c7\u5458\u7684\u60c5\u51b5\u53ca\u5176\u85aa\u6c34\u60c5\u51b5<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120502540162.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120502540162.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.5\u4f7f\u7528\u5185\u8fde\u63a5\u67e5\u8be2\u540d\u5b57\u4e3a\u201c\u5218\u660e\u201d\u7684\u5458\u5de5\u6240\u5728\u90e8\u95e8<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025501695.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025501695.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.6\u67e5\u627e\u8d22\u52a1\u90e8\u6536\u5165\u57282000\u5143\u4ee5\u4e0a\u7684\u96c7\u5458\u59d3\u540d\u548c\u85aa\u6c34\u8be6\u60c5<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025519631.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025519631.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.7\u67e5\u8be2\u8d22\u52a1\u90e8\u96c7\u5458\u7684\u6700\u9ad8\u548c\u6700\u4f4e\u5b9e\u9645\u6536\u5165<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025532868.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025532868.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.8\u67e5\u8be2employee\u4e2d\u7537\u6027\u548c\u5973\u6027\u7684\u4eba\u6570<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025544290.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025544290.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.9\u67e5\u627e\u5458\u5de5\u6570\u8d85\u8fc72\u4eba\u7684\u90e8\u95e8\u540d\u79f0\u548c\u5458\u5de5\u6570\u91cf<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025617739.jpg#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025617739.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>3.2.10\u5c06employee\u8868\u4e2d\u7684\u5458\u5de5\u53f7\u7801\u7531\u5927\u5230\u5c0f\u6392\u5217<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205025626631.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" src=\"https:\/\/cdn.jsdelivr.net\/gh\/moezx\/cdn@3.0.2\/img\/svg\/loader\/trans.ajax-spinner-preloader.svg\" onerror=\"imgError(this)\"  alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205025626631.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<p>3.3\u8be6\u7ec6\u7684\u5b9e\u9a8c\u8d44\u6599\u4ee5\u53ca\u6307\u5bfcPPT\u8bf7\u8bbf\u95ee\u7b14\u8005GitHub\u5730\u5740\uff1a<a href=\"https:\/\/github.com\/LJF2402901363\/database_experiment.git\" target=\"_blank\"  rel=\"nofollow\" >https:\/\/github.com\/LJF2402901363\/database_experiment.git<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>3 \u6570\u636e\u67e5\u8be2\u5b9e\u9a8c 3.1\u5355\u8868\u67e5\u8be2 3.1.1Select \u8bed\u53e5\uff0cSQL\u6838\u5fc3\uff0c\u8bed\u6cd5\u683c\u5f0f\u5982\u4e0b\uff1a SQL\u5173\u952e\u5b57\u7684\u6267\u884c\u987a\u5e8f\uff1a from x 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