{"id":374,"date":"2020-12-05T03:25:37","date_gmt":"2020-12-04T19:25:37","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=374"},"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%83%ef%bc%89-%e5%8f%82%e7%85%a7%e6%80%a7%e5%ae%8c%e6%95%b4%e5%ae%9e%e9%aa%8c","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/experiment\/mysqlexperiment\/374.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e03\uff09\u2014\u2014\u53c2\u7167\u6027\u5b8c\u6574\u5b9e\u9a8c"},"content":{"rendered":"\n<h2>7.\u53c2\u7167\u6027\u5b8c\u6574\u5b9e\u9a8c<\/h2>\n\n\n\n<h2>7.1\u5b9a\u4e49<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u53c2\u7167\u5b8c\u6574\u6027\uff1a\u662f\u6307\u4fdd\u8bc1\u4e3b\u5173\u952e\u5b57\uff08\u88ab\u5f15\u7528\u8868\uff09\u548c\u5916\u90e8\u5173\u952e\u5b57\uff08\u5f15\u7528\u8868\uff09\u4e4b\u95f4\u7684\u53c2\u7167\u5173\u7cfb\u3002\u5b83\u6d89\u53ca\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a\u8868\u6570\u636e\u7684\u4e00\u81f4\u6027\u7ef4\u62a4\u3002\u5916\u952e\u503c\u5c06\u5f15\u7528\u8868\u4e2d\u5305\u542b\u6b64\u5916\u952e\u7684\u8bb0\u5f55\u548c\u88ab\u5f15\u7528\u8868\u4e2d\u4e3b\u952e\u4e0e\u5916\u952e\u76f8\u5339\u914d\u7684\u8bb0\u5f55\u5173\u8054\u8d77\u6765\u3002\u5728\u8f93\u5165\u3001\u66f4\u6539\u6216\u5220\u9664\u8bb0\u5f55\u65f6\uff0c\u53c2\u7167\u5b8c\u6574\u6027\u4fdd\u6301\u8868\u4e4b\u95f4\u5df2\u5b9a\u4e49\u7684\u5173\u7cfb\uff0c\u786e\u4fdd\u952e\u503c\u5728\u6240\u6709\u8868\u4e2d\u4e00\u81f4\u3002\u8fd9\u6837\u7684\u4e00\u81f4\u6027\u8981\u6c42\u786e\u4fdd\u4e0d\u4f1a\u5f15\u7528\u4e0d\u5b58\u5728\u7684\u503c\uff0c\u5982\u679c\u952e\u503c\u66f4\u6539\u4e86\uff0c\u90a3\u4e48\u5728\u6574\u4e2a\u6570\u636e\u5e93\u4e2d\uff0c\u5bf9\u8be5\u952e\u503c\u7684\u6240\u6709\u5f15\u7528\u8981\u8fdb\u884c\u4e00\u81f4\u7684\u66f4\u6539\u3002\u53c2\u7167\u5b8c\u6574\u6027\u662f\u57fa\u4e8e\u5916\u952e\u4e0e\u4e3b\u952e\u4e4b\u95f4\u7684\u5173\u7cfb\u3002<\/p><\/blockquote>\n\n\n\n<p>\u200b \u4f8b\u5982\u5b66\u751f\u5b66\u4e60\u8bfe\u7a0b\u7684\u8bfe\u7a0b\u53f7\u5fc5\u987b\u662f\u6709\u6548\u7684\u8bfe\u7a0b\u53f7\uff0cscore\u8868\uff08\u6210\u7ee9\u8868\uff09\u7684\u5916\u952ecno\uff08\u8bfe\u7a0b\u53f7\uff09\u5c06\u53c2\u8003course\u8868\uff08\u8bfe\u7a0b\u8868\uff09\u4e2d\u4e3b\u952ecno\uff08\u8bfe\u7a0b\u53f7\uff09\u4ee5\u5b9e\u73b0\u6570\u636e\u5b8c\u6574\u6027<\/p>\n\n\n\n<h3>7.2\u8bed\u6cd5<\/h3>\n\n\n\n<h4>7.2.1\u521b\u5efa\u8868\u65f6\u5b9a\u4e49\u53c2\u7167\u5b8c\u6574\u6027<\/h4>\n\n\n\n<h5>7.2.1.1\u5217\u7ea7\u53c2\u7167\u5b8c\u6574\u6027<\/h5>\n\n\n\n<p>\u5217\u5b9a\u4e49\u65f6\u52a0\u4e0a\u5173\u952e\u5b57 REFERENCES ref_table_name(ref_key)<\/p>\n\n\n\n<h5>7.2.1.2\u8868\u7ea7\u53c2\u7167\u5b8c\u6574\u6027<\/h5>\n\n\n\n<h6>7.2.1.2.1\u8868\u5b9a\u4e49\u65f6\uff0c\u5728\u8bed\u53e5\u6700\u540e\u52a0\u4e0a<\/h6>\n\n\n\n<pre class=\"wp-block-code\"><code>CONSTRAINT ref_key_name FOREIGN KEY (ref_key) REFERENCES ref_table_name(ref_key)<\/code><\/pre>\n\n\n\n<h3>7.2.2\u521b\u5efa\u8868\u540e\u5b9a\u4e49\u53c2\u7167\u5b8c\u6574\u6027<\/h3>\n\n\n\n<p>\u4f7f\u7528ALTER TABLE\u547d\u4ee4<\/p>\n\n\n\n<h4>7.2.3\u53c2\u7167\u6027\u5b9a\u4e49<\/h4>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u53c2\u7167\u6027\u5b9a\u4e49=\uff1a<br>REFERENCES \u8868\u540d [(\u7d22\u5f15\u5217\u540d \u2026 )]<br>[ON DELETE {RESTRICT | CASCADE | SET NULL | NO ACTION}]<br>[ON UPDATE {RESTRICT | CASCADE | SET NULL | NO ACTION}]<br>\u7d22\u5f15\u5217\u540d=\uff1a<br>\u5217\u540d [(\u957f\u5ea6)] [ASC | DESC]<\/p><\/blockquote>\n\n\n\n<h4>7.2.4\u53c2\u7167\u52a8\u4f5c<\/h4>\n\n\n\n<p>\u6307\u5b9a\u8fd9\u4e2a\u53c2\u7167\u52a8\u4f5c\u5e94\u7528\u54ea\u4e00\u6761\u8bed\u53e5\uff1a\u8fd9\u91cc\u6709\u4e24\u6761\u76f8\u5173\u7684\u8bed\u53e5\uff0c\u5373UPDATE\u548cDELETE\u8bed\u53e5\uff1b<br>\u6307\u5b9a\u91c7\u53d6\u54ea\u4e2a\u52a8\u4f5c\uff1a\u53ef\u80fd\u91c7\u53d6\u7684\u52a8\u4f5c\u662fRESTRICT\uff08\u9650\u5236\uff09\u3001CASCADE\uff08\u7ea7\u8054\uff09\u3001SET NULL\u3001NO ACTION\u548cSET DEFAULT\u3002<\/p>\n\n\n\n<blockquote class=\"wp-block-quote\"><p>\u2460RESTRICT\uff08\u9650\u5236\uff09\uff1a\u5f53\u8981\u5220\u9664\u6216\u66f4\u65b0\u7236\u8868\u65f6\uff0c\u5982\u679c\u5b50\u8868\u6709\u5339\u914d\u7684\u9879\uff0c\u62d2\u7edd\u5bf9\u7236\u8868\u7684\u5220\u9664\u6216\u66f4\u65b0\u64cd\u4f5c<br>\u2461CASCADE\uff08\u7ea7\u8054\uff09\uff1a\u5728\u7236\u8868\u4e0aupdate\/delete\u8bb0\u5f55\u65f6\uff0c\u540c\u6b65update\/delete\u6389\u5b50\u8868\u7684\u5339\u914d\u8bb0\u5f55 .<br>\u2462SET NULL\uff1a\u5728\u7236\u8868\u4e0aupdate\/delete\u8bb0\u5f55\u65f6\uff0c\u5c06\u5b50\u8868\u4e0a\u5339\u914d\u8bb0\u5f55\u7684\u5217\u8bbe\u4e3anull (\u8981\u6ce8\u610f\u5b50\u8868\u7684\u5916\u952e\u5217\u4e0d\u80fd\u4e3anot null) \u3002\u5982\u679c\u5916\u952e\u5217\u6ca1\u6709\u6307\u5b9aNOT NULL\u9650\u5b9a\u8bcd\uff0c\u8fd9\u5c31\u662f\u5408\u6cd5\u7684\u3002<br>\u2463NO ACTION\uff1aNO ACTION\u610f\u5473\u7740\u4e0d\u91c7\u53d6\u52a8\u4f5c\uff0c\u5c31\u662f\u5982\u679c\u6709\u4e00\u4e2a\u76f8\u5173\u7684\u5916\u952e\u503c\u5728\u88ab\u53c2\u8003\u7684\u8868\u91cc\uff0c\u5220\u9664\u6216\u66f4\u65b0\u7236\u8868\u4e2d\u4e3b\u8981\u952e\u503c\u7684\u4f01\u56fe\u4e0d\u88ab\u5141\u8bb8\uff0c\u548cRESTRICT\u4e00\u6837<br>\u2464SET DEFAULT\uff1a\u4f5c\u7528\u548cSET NULL\u4e00\u6837\uff0c\u53ea\u4e0d\u8fc7SET DEFAULT\u662f\u6307\u5b9a\u5b50\u8868\u4e2d\u7684\u5916\u952e\u5217\u4e3a\u9ed8\u8ba4\u503c<\/p><\/blockquote>\n\n\n\n<h2>7.3\u521b\u5efa\u8bed\u53e5\uff1a<\/h2>\n\n\n\n<pre class=\"wp-block-code\"><code>create table if not exists salary1(employeeID char(6) not null,income double,outcome double,foreign key(employeeID) references salary(employeeID) on delete CASCADE on update CASCADE);<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205032324568.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\/20201205032324568.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>7.4\u4ecesalary\u8868\u4e2d\u590d\u5236\u6570\u636e\u5230salary1\u8868\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>insert into salary1(employeeID,income,outcome) select employeeID,income,outcome from salary;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205032345186.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\/20201205032345186.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<h3>7.5\u5220\u9664salary\u8868\u4e2d\u7684\u4e00\u884c\u6570\u636e\uff0c\u518d\u67e5\u770bsalary1\u8868\u7684\u5185\u5bb9\uff0c\u770b\u770b\u4f1a\u53d1\u751f\u4ec0\u4e48\u60c5\u51b5<\/h3>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205032425977.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\/20201205032425977.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>\u4ece\u8868\u4e2d\u53ef\u4ee5\u53d1\u73b0\uff0c\u4ecesalary\u8868\u4e2d\u5220\u9664\u4e86employeeID =10008\u7684\u8bb0\u5f55\uff0c\u7136\u540e\u53d1\u73b0\u4ece\u8868salary1\u4e2dEmployeeID=10008\u7684\u8bb0\u5f55\u4e5f\u88ab\u5220\u9664\u4e86\u3002\u8fd9\u662f\u56e0\u4e3asalary1\u8868\u4e2d\u53c2\u7167\u5b8c\u6574\u6027\u7684\u5916\u952e\u4e3aEmployeeID\uff0c\u5176\u53c2\u7167\u6027\u952e\u5e76\u4e14\u6307\u5b9a\u4e86\u53c2\u7167\u6027\u52a8\u4f5cdelete\u548cupdate\u7684\u7ea7\u522b\u4e3a\uff1aCASCADE\uff08\u7ea7\u8054\uff09\uff1a\u5728\u7236\u8868\u4e0aupdate\/delete\u8bb0\u5f55\u65f6\uff0c\u540c\u6b65update\/delete\u6389\u5b50\u8868\u7684\u5339\u914d\u8bb0\u5f55\u3002\u56e0\u6b64\u5f53\u8868salary\u8868\u4e2d\u6570\u636e\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u4f1a\u540c\u6b65\u5230salary1\u8868\u4e2d\u3002<\/p>\n\n\n\n<p>7.6\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>7.\u53c2\u7167\u6027\u5b8c\u6574\u5b9e\u9a8c 7.1\u5b9a\u4e49 \u53c2\u7167\u5b8c\u6574\u6027\uff1a\u662f\u6307\u4fdd\u8bc1\u4e3b\u5173\u952e\u5b57\uff08\u88ab\u5f15\u7528\u8868\uff09\u548c\u5916\u90e8\u5173\u952e\u5b57\uff08\u5f15\u7528\u8868\uff09\u4e4b\u95f4\u7684\u53c2\u7167\u5173\u7cfb\u3002\u5b83\u6d89\u53ca\u4e24\u4e2a\u6216\u4e24\u4e2a\u4ee5\u4e0a &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[120],"tags":[32,135],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/374"}],"collection":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/comments?post=374"}],"version-history":[{"count":3,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/374\/revisions"}],"predecessor-version":[{"id":394,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/374\/revisions\/394"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=374"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=374"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=374"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}