{"id":362,"date":"2020-12-05T02:18:28","date_gmt":"2020-12-04T18:18:28","guid":{"rendered":"http:\/\/moyisuiying.com\/?p=362"},"modified":"2020-12-10T14:23:36","modified_gmt":"2020-12-10T06:23:36","slug":"mysql%e5%ad%a6%e4%b9%a0%e4%b8%8e%e5%ae%9e%e9%aa%8c%ef%bc%88%e4%b8%80%ef%bc%89-%e6%95%b0%e6%8d%ae%e5%ba%93%e5%ae%9a%e4%b9%89%e4%b8%8e%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"http:\/\/moyisuiying.com\/index.php\/javastudy\/mysql\/362.html","title":{"rendered":"MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e00\uff09\u2014\u2014\u6570\u636e\u5e93\u5b9a\u4e49\u4e0e\u64cd\u4f5c"},"content":{"rendered":"\n<h2>MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e00\uff09\u2014\u2014\u6570\u636e\u5e93\u5b9a\u4e49\u4e0e\u64cd\u4f5c<\/h2>\n\n\n\n<h3>1.1\u521b\u5efa\u6570\u636e\u5e93\u8bed\u53e5<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE  DATABASE &#91;IF NOT EXISTS] \u6570\u636e\u5e93\u540d &#91;\u9009\u9879...];<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc\u521b\u5efa\u4e00\u4e2aDBMS\u7684\u6570\u636e\u5e93<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code> create database if not exists DBMS character set gbk;<\/code><\/pre>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205015803286.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>\u8fd9\u91cc\u4f7f\u7528\u4e86if not exists \u8fd9\u4e2a\u6761\u4ef6\uff0c\u610f\u601d\u662f\u5982\u679c\u4e0d\u5b58\u5728\u8be5\u6570\u636e\u5e93\u5219\u521b\u5efa\uff0c\u5982\u679c\u5df2\u7ecf\u5b58\u5728\u4e86\u5219\u4e0d\u521b\u5efa\u3002\u6bd4\u5982\u8fd9\u4e2aDBMS\u6570\u636e\u5e93\u5df2\u7ecf\u88ab\u521b\u5efa\uff0c\u8fd9\u65f6\u5019\u5c31\u4e0d\u4f1a\u91cd\u590d\u521b\u5efa\u8fd9\u4e2a\u6570\u636e\u5e93\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u8fd9\u4e2aif not exists\u90a3\u4e48\u76f4\u63a5\u4f7f\u7528\u521b\u5efa\u6570\u636e\u5e93\u8bed\u53e5\uff1acreate database DBMS character set gbk;<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205015803286.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u8fd9\u91cc\u4f7f\u7528\u4e86if not exists \u8fd9\u4e2a\u6761\u4ef6\uff0c\u610f\u601d\u662f\u5982\u679c\u4e0d\u5b58\u5728\u8be5\u6570\u636e\u5e93\u5219\u521b\u5efa\uff0c\u5982\u679c\u5df2\u7ecf\u5b58\u5728\u4e86\u5219\u4e0d\u521b\u5efa\u3002\u6bd4\u5982\u8fd9\u4e2aDBMS\u6570\u636e\u5e93\u5df2\u7ecf\u88ab\u521b\u5efa\uff0c\u8fd9\u65f6\u5019\u5c31\u4e0d\u4f1a\u91cd\u590d\u521b\u5efa\u8fd9\u4e2a\u6570\u636e\u5e93\uff0c\u5982\u679c\u4e0d\u4f7f\u7528\u8fd9\u4e2aif not exists\u90a3\u4e48\u76f4\u63a5\u4f7f\u7528\u521b\u5efa\u6570\u636e\u5e93\u8bed\u53e5\uff1acreate database DBMS character set gbk;<\/p><\/noscript>\n\n\n\n<p>\u5219\u4f1a\u62a5\u9519\uff1a<br><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205015942715.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\"><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205015942715.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p><\/noscript>\n\n\n\n<h3>1.2.\u4fee\u6539\u6570\u636e\u5e93\u4fe1\u606f\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code> alter database \u6570\u636e\u5e93\u540d \u4fee\u6539\u9009\u9879  \u4fee\u6539\u7684\u65b0\u503c<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>  alter database DBMS character set utf8mb4;<\/code><\/pre>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020114791.png\" 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>\u4f7f\u7528\u67e5\u770b\u6570\u636e\u5e93\u4fe1\u606f\u547d\u4ee4\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93DBMS\u7684\u4fe1\u606f\uff1a<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205020114791.png\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u4f7f\u7528\u67e5\u770b\u6570\u636e\u5e93\u4fe1\u606f\u547d\u4ee4\u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93DBMS\u7684\u4fe1\u606f\uff1a<\/p><\/noscript>\n\n\n\n<pre class=\"wp-block-code\"><code> show create database dbms;<\/code><\/pre>\n\n\n\n<p><img  src=\"https:\/\/img-blog.csdnimg.cn\/20201205020157713.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u53ef\u4ee5\u53d1\u73b0\uff0c\u6211\u4eec\u521a\u5f00\u59cb\u521b\u5efa\u7684\u65f6\u5019\u8fd9\u4e2a\u6570\u636e\u5e93\u7684\u7f16\u7801\u8bbe\u7f6e\u201cgbk\u201d\uff0c\u73b0\u5728\u5df2\u7ecf\u6539\u53d8\u4e3a\u4e86\u201cutf8mb4\u201d\uff0c\u7136\u540e\u5f00\u59cb\u5c06\u7f16\u7801\u4fee\u6539\u4e3a\u539f\u6765\u7684\u6837\u5b50\uff1a<br><img  class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020230252.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\"><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205020157713.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>\u53ef\u4ee5\u53d1\u73b0\uff0c\u6211\u4eec\u521a\u5f00\u59cb\u521b\u5efa\u7684\u65f6\u5019\u8fd9\u4e2a\u6570\u636e\u5e93\u7684\u7f16\u7801\u8bbe\u7f6e\u201cgbk\u201d\uff0c\u73b0\u5728\u5df2\u7ecf\u6539\u53d8\u4e3a\u4e86\u201cutf8mb4\u201d\uff0c\u7136\u540e\u5f00\u59cb\u5c06\u7f16\u7801\u4fee\u6539\u4e3a\u539f\u6765\u7684\u6837\u5b50\uff1a<br><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205020230252.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><\/p><\/noscript>\n\n\n\n<p>\u53ef\u4ee5\u53d1\u73b0\u4fee\u6539\u6210\u529f\u4e86\u3002<\/p>\n\n\n\n<h3>1.3\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u6570\u636e\u5e93tempDBMS\u7136\u540e\u5220\u9664<\/h3>\n\n\n\n<h4>1.3.1\u5efa\u8868\u8bed\u53e5\uff1adrop database if exists tempDBMS;<\/h4>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120502031083.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\/2020120502031083.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>1.3.2\u5220\u9664\u6570\u636e\u5e93\uff1adrop database \u6570\u636e\u5e93\u540d<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code> drop database  tempDBMS;<\/code><\/pre>\n\n\n\n<p><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020354354.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>\u53ef\u4ee5\u770b\u5230\u8be5\u6570\u636e\u5e93\u5df2\u7ecf\u88ab\u5220\u9664\u4e86\u3002<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205020354354.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>\u53ef\u4ee5\u770b\u5230\u8be5\u6570\u636e\u5e93\u5df2\u7ecf\u88ab\u5220\u9664\u4e86\u3002<\/p><\/noscript>\n\n\n\n<h3>1.4.\u521b\u5efa\u8868<\/h3>\n\n\n\n<h4>1.4.1\u65b0\u5efa<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE employee (employeeID CHAR(6) NOT NULL PRIMARY KEY, name CHAR(10) NOT NULL, education CHAR(4) NOT NULL,birth DATE NOT NULL, gender TINYINT(1) NOT NULL DEFAULT 1,workYear TINYINT(1),address VARCHAR(100),phone CHAR(12), departmentID CHAR(3) REFERENCES department(departmentID));<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020432808.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\/20201205020432808.jpg#pic_center\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>1.4.2\u4ece\u5df2\u6709\u6570\u636e\u4e2d\u65b0\u5efa\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE  TABLE &#91;IF NOT EXISTS] \u8868\u540d  &#91; ( ) LIKE \u5df2\u6709\u8868\u540d &#91; ] ] | &#91;AS ( \u8868\u8fbe\u5f0f )];<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120502053725.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/2020120502053725.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/2020120502053722.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/2020120502053722.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>1.5\u4fee\u6539\u8868<\/h3>\n\n\n\n<h4>1.5.1\u9996\u5148\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u4f8b\u5b50\u7684\u8868 person\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>create table if not exists person (id int(8) primary key auto_increment,name varchar(20) not null,password varchar(20) not null,sex tinyint(1) not null,address varchar(128));<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020642215.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\/20201205020642215.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>1.5.2\u4fee\u6539\u8868\u540d\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>rename table  \u8868\u540d  to  \u65b0\u7684\u8868\u540d<\/code><\/pre>\n\n\n\n<p>\u4fee\u6539\u8868person\u7684\u540d\u4e3anewperson\uff1a<br><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020712542.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\"><\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205020712542.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\"><\/p><\/noscript>\n\n\n\n<h3>1.5.2\u5220\u9664\u5217\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name drop col-name;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> alter table newperson drop sex ;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020751546.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\/20201205020751546.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>\u53ef\u89c1\u5220\u9664\u5217\u201csex\u201d\u6210\u529f\u3002<\/p>\n\n\n\n<h4>1.5.3\u589e\u52a0\u5217(\u5355\u5217)\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name add col-name col-type comment 'xxx';<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020821776.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\/20201205020821776.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>1.5.4\u589e\u52a0\u8868\u5b57\u6bb5\u5e76\u6307\u660e\u5b57\u6bb5\u653e\u7f6e\u4e3a\u7b2c\u4e00\u5217\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name add col-name col-type COMMENT 'sss' FIRST;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table newperson add column age int(3) comment \"\u5e74\u9f84\" first;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205020857385.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/20201205020857385.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h3>1.5.5\u589e\u52a0\u8868\u5b57\u6bb5\u5e76\u6307\u660e\u5b57\u6bb5\u653e\u7f6e\u4e3a\u7279\u5b9a\u5217\u540e\u9762\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name add col-name col-type after col-name-1;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> alter table newperson add column jobName varchar(20) comment \"\u5de5\u4f5c\u540d\u79f0\" after id;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021003799.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\/20201205021003799.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>1.5.6\u4f7f\u7528MODIFY\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name  modify  column col-name col-type;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> alter table newperson modify name varchar(40) not null;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021046302.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/20201205021046302.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>1.5.7\u4f7f\u7528CHANGE\u4fee\u6539\u5b57\u6bb5\u7c7b\u578b\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name change col-name col-name col-type;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> alter table newperson change address newAddress varchar(64) not null;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021129313.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\/20201205021129313.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>1.5.8\u4fee\u6539\u5b57\u6bb5\u7684\u9ed8\u8ba4\u503c\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name alter col-name set default \u8981\u8bbe\u7f6e\u7684\u9ed8\u8ba4\u503c;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code> alter table newperson alter age set default 18;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021206230.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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\/20201205021206230.png?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"\/><\/figure><\/noscript>\n\n\n\n<h4>1.5.9\u5b57\u6bb5\u5220\u9664\u9ed8\u8ba4\u503c\uff1a<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table table-name alter col-name drop default;<\/code><\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>alter table newperson alter age drop default;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021244513.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\/20201205021244513.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>1.6.\u5220\u9664\u4e34\u65f6\u8868\uff1a<\/h3>\n\n\n\n<pre class=\"wp-block-code\"><code>drop table \u8868\u540d &#91;if exists]\n drop table if exists;<\/code><\/pre>\n\n\n\n<figure class=\"wp-block-image\"><img   class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/20201205021314308.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\/20201205021314308.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>1.7\u601d\u8003\u4e0e\u7ec3\u4e60<\/h3>\n\n\n\n<p><strong>\u521b\u5efa\u4e00\u4e2a\u57fa\u672c\u8868\u7684\u65f6\u5019\uff0cLIKE\u548cAS\u6709\u4f55\u533a\u522b\uff1f\u8bd5\u7740\u5bf9\u6bd4\u8868\u6570\u636e\u548c\u8868\u7ed3\u6784\u3002<\/strong><\/p>\n\n\n\n<p>\u521b\u5efa\u8868\u65f6\u4ece\u5df2\u6709\u6570\u636e\u4e2d\u590d\u5236\uff1a<\/p>\n\n\n\n<p>CREATE TABLE employee2 LIKE employee ;\u548cCREATE TABLE employee3 AS (SELECT * FROM employee );\u7684\u533a\u522b\uff1a<\/p>\n\n\n\n<p>CREATE TABLE employee2 LIKE employee ;\u521b\u5efa\u8868\u65f6\u590d\u5236\u7684\u662femployee \u7684\u8868\u7ed3\u6784\uff0c\u4f46\u662f\u5e76\u6ca1\u6709\u590d\u5236employee \u4e2d\u7684\u6570\u636e\u5230employee2\u4e2d\uff0c\u67e5\u8be2\u6570\u636e\u65f6\u4e3a\u7a7a\u3002<br><img  src=\"https:\/\/img-blog.csdnimg.cn\/20201205021406952.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br><img  class=\"lazyload\" data-src=\"https:\/\/img-blog.csdnimg.cn\/2020120502140755.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" 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>CREATE TABLE employee3 AS (SELECT * FROM employee );\u521b\u5efa\u8868\u65f6\u4e0d\u4ec5\u628aemployee \u7684\u7ed3\u6784\u590d\u5236\u8fc7\u6765\u4e86\uff0c\u5176\u4e2d\u7684\u6570\u636e\u4e5f\u590d\u5236\u8fc7\u6765\u4e86\uff0cemployee3 \u548cemployee3\u7684\u6570\u636e\u4e00\u81f4\u3002<\/p >\n<noscript><img src=\"https:\/\/img-blog.csdnimg.cn\/20201205021406952.jpg\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br><img src=\"https:\/\/img-blog.csdnimg.cn\/2020120502140755.jpg?x-oss-process=image\/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTE4NzAwMjI=,size_16,color_FFFFFF,t_70\" alt=\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"><br>CREATE TABLE employee3 AS (SELECT * FROM employee );\u521b\u5efa\u8868\u65f6\u4e0d\u4ec5\u628aemployee \u7684\u7ed3\u6784\u590d\u5236\u8fc7\u6765\u4e86\uff0c\u5176\u4e2d\u7684\u6570\u636e\u4e5f\u590d\u5236\u8fc7\u6765\u4e86\uff0cemployee3 \u548cemployee3\u7684\u6570\u636e\u4e00\u81f4\u3002<\/p><\/noscript>\n\n\n\n<p>1.8\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>MYSQL\u5b66\u4e60\u4e0e\u5b9e\u9a8c\uff08\u4e00\uff09\u2014\u2014\u6570\u636e\u5e93\u5b9a\u4e49\u4e0e\u64cd\u4f5c 1.1\u521b\u5efa\u6570\u636e\u5e93\u8bed\u53e5 \u8fd9\u91cc\u521b\u5efa\u4e00\u4e2aDBMS\u7684\u6570\u636e\u5e93 \u8fd9\u91cc\u4f7f\u7528\u4e86if not exi &#8230;<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[94,120],"tags":[32,122,121],"_links":{"self":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/362"}],"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=362"}],"version-history":[{"count":2,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/362\/revisions"}],"predecessor-version":[{"id":388,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/posts\/362\/revisions\/388"}],"wp:attachment":[{"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/media?parent=362"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/categories?post=362"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/moyisuiying.com\/index.php\/wp-json\/wp\/v2\/tags?post=362"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}