{"id":2026,"date":"2020-07-29T23:13:52","date_gmt":"2020-07-29T15:13:52","guid":{"rendered":"http:\/\/39.97.231.10\/?p=2026"},"modified":"2020-07-29T23:13:52","modified_gmt":"2020-07-29T15:13:52","slug":"mysql%e8%a1%a8%e6%93%8d%e4%bd%9c","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=2026","title":{"rendered":"MySQL \u8868\u64cd\u4f5c"},"content":{"rendered":"
\n
\n

MySQL\u4fee\u6539\u8868\u540d\u79f0<\/h2>\n<\/div>\n
\n
\n
\nMySQL\u63d0\u4f9b\u4fee\u6539\u8868\u540d\u79f0\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n
    \n
  1. rename table tb to tb1;<\/li>\n
  2. alter table tb rename to tb1;<\/li>\n
  3. alter table tb rename as tb1;<\/li>\n<\/ol>\n

    \u4ee5\u4e0a\u4e09\u79cd\u8bed\u6cd5\u90fd\u53ef\u4ee5\u5b9e\u73b0\u4fee\u6539MySQL\u8868\u540d\u79f0\u3002
    \n\u6ce8\u610f\uff1a<\/strong>
    \n\u4fee\u6539\u8868\u540d\u79f0\u6709\u98ce\u9669\uff0c\u5982\u679c\u5e94\u7528\u670d\u52a1\u4ecd\u7136\u5728\u8bbf\u95ee\u8be5\u8868\uff0c\u76f4\u63a5\u4fee\u6539\u8868\u540d\u79f0\uff0c\u4f1a\u5bfc\u81f4\u5e94\u7528\u670d\u52a1\u62a5\u9519\uff0c\u5f15\u8d77\u751f\u4ea7\u4e8b\u6545\uff0c\u4e0d\u5efa\u8bae\u76f4\u63a5\u5728\u751f\u4ea7\u73af\u5883\u4fee\u6539\u8868\u540d\u79f0\uff0c\u9664\u975e\u771f\u7684\u786e\u5b9a\u6709\u628a\u63e1\u3002\n<\/div>\n<\/div>\n<\/div>\n

    \n

    MySQL\u67e5\u8be2\u6570\u636eselect<\/h2>\n<\/div>\n
    \n
    \n
    \u4e00\u3001\u7b80\u5355\u67e5\u8be2<\/div>\n
    <\/div>\n
    \u67e5\u8be2\u8868\u7684\u6240\u6709\u5b57\u6bb5\uff1a<\/div>\n
    select * from table_name;<\/div>\n
    <\/div>\n
    \u67e5\u8be2\u6307\u5b9a\u5b57\u6bb5\uff1a<\/div>\n
    select name,age from table_name;<\/div>\n
    <\/div>\n
    \u67e5\u8be2\u8868\u4e2d\u8bb0\u5f55\u603b\u6570\uff1a<\/div>\n
    select count(*) from table_name;<\/div>\n
    <\/div>\n
    <\/div>\n
    \u4e8c\u3001\u5e26where\u6761\u4ef6\u7684\u67e5\u8be2<\/div>\n
    <\/div>\n
    \u67e5\u8be2\u7b26\u5408\u6307\u5b9a\u6761\u4ef6\u7684\u8bb0\u5f55\uff1a<\/div>\n
    select * from table_name where name=\\’Tom\\’;<\/div>\n
    <\/div>\n
    \u591a\u4e2a\u6761\u4ef6AND\u67e5\u8be2\uff1a<\/div>\n
    select * from table_name where name=\\’Tom\\’ and age > 18;<\/div>\n
    <\/div>\n
    \u591a\u4e2a\u6761\u4ef6OR\u67e5\u8be2\uff1a<\/div>\n
    select * from table_name where name=\\’Tom\\’ or name = \\’Bill\\’;<\/div>\n
    <\/div>\n
    \u591a\u4e2a\u6761\u4ef6IN\u67e5\u8be2\uff0c\u4e0e\u4e0a\u4f8bOR\u67e5\u8be2\u7b49\u540c\uff1a<\/div>\n
    select * from table_name where name in (\\’Tom\\’, \\’Bill\\’);<\/div>\n
    <\/div>\n
    <\/div>\n
    \u4e09\u3001limit offset\u67e5\u8be2\u5206\u9875\uff0c\u9650\u5236\u6700\u5927\u8fd4\u56de\u8bb0\u5f55\u6570<\/b><\/div>\n
    <\/div>\n
    \u6700\u591a\u53ea\u8fd4\u56de\u524d10\u6761\u8bb0\u5f55<\/div>\n
    select * from table_name limit 10;<\/div>\n
    <\/div>\n
    \u8df3\u8fc7\u524d20\u4e4b\u540e\u53d610\u6761\u8bb0\u5f55\uff0c\u8fd9\u91cc20\u662foffset\uff0c10\u662flimit\u3002<\/div>\n
    select * from table_name limit 20,10;<\/div>\n
    <\/div>\n
    \u4e5f\u53ef\u4ee5\u663e\u5f0f\u5730\u4f7f\u7528limit offset\u5173\u952e\u5b57\uff0c\u5982\u4e0b\uff1a<\/div>\n
    select * from table_name limit 10 offset 20;<\/div>\n
    <\/div>\n<\/div>\n<\/div>\n
    \n
    \n
    \n

    MySQL\u66f4\u65b0\u6570\u636eupdate<\/h2>\n<\/div>\n
    \n
    \n
    \nMySQL\u4f7f\u7528update\u8bed\u6cd5\u6765\u66f4\u65b0\u8868\u4e2d\u7684\u6570\u636e\uff0c\u4e0b\u9762\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u89c1\u7684update\u7528\u6cd5\u3002<\/p>\n

    1\u3001update\u8bed\u6cd5<\/h4>\n

    update table_name set field1=value1,field2=value2,…,fieldN=valueN [where clause]
    \n\u5982\u679c\u6ca1\u6709\u6307\u5b9awhere\u5b50\u53e5\uff0c\u5219\u4f1a\u5c06\u8868\u4e2d\u6240\u6709\u6570\u636e\u66f4\u65b0\uff0c\u8c28\u614e\u4f7f\u7528\uff0c\u4e00\u4e0d\u5c0f\u5fc3\u8bef\u66f4\u65b0\u6570\u636e\uff0c\u6062\u590d\u8d77\u6765\u5f88\u9ebb\u70e6\u3002<\/p>\n

    2\u3001update\u793a\u4f8b<\/h4>\n

    2.1 \u66f4\u65b0\u8868\u4e2d\u6240\u6709\u6570\u636e<\/strong>
    \nupdate table_name set age = 20;
    \n2.2 \u66f4\u65b0\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u636e<\/strong>
    \nupdate table_name set age = 20 where id=1;
    \n2.3 \u66f4\u65b0\u5b57\u6bb5\u503c\uff0c\u5728\u539f\u6709\u503c\u57fa\u7840\u4e0a\u52a01<\/strong>
    \nupdate table_name set age=age+1;
    \n2.4 limit\u9650\u5236\u66f4\u65b0\u7684\u8bb0\u5f55\u6570<\/strong>
    \nupdate table_name set age=age+1 limit 10;\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n

    <\/h2>\n

    MySQL\u5220\u9664\u6570\u636edelete<\/h2>\n<\/div>\n
    \n
    \n
    \nMySQL\u4f7f\u7528delete\u8bed\u6cd5\u6765\u5220\u9664\u8868\u4e2d\u7684\u6570\u636e\uff0c\u4e0b\u9762\u4ecb\u7ecd\u4e00\u4e9b\u5e38\u89c1\u7684delete\u7528\u6cd5\u3002<\/p>\n

    1\u3001delete\u8bed\u6cd5<\/h4>\n

    delete from table_name [where clause]
    \n\u5982\u679c\u6ca1\u6709\u6307\u5b9awhere\u5b50\u53e5\uff0c\u5219\u4f1a\u5c06\u8868\u4e2d\u6240\u6709\u6570\u636e\u5220\u9664\uff0c\u8c28\u614e\u4f7f\u7528\uff0c\u4e00\u4e0d\u5c0f\u5fc3\u8bef\u5220\u6570\u636e\uff0c\u6062\u590d\u8d77\u6765\u5f88\u9ebb\u70e6\u3002<\/p>\n

    2\u3001delete\u793a\u4f8b<\/h4>\n

    2.1 \u5220\u9664\u8868\u4e2d\u6240\u6709\u6570\u636e<\/strong>
    \ndelete from table_name;
    \n2.2 \u5220\u9664\u6ee1\u8db3\u6761\u4ef6\u7684\u6570\u636e<\/strong>
    \ndelete from table_name where id=1;
    \n2.3 limit\u9650\u5236\u5220\u9664\u7684\u8bb0\u5f55\u6570<\/strong>
    \ndelete from table_name limit 10;
    \n\u6ce8\uff1a<\/strong>
    \n\u5220\u9664\u5168\u8868\u6570\u636e\uff0c\u4e0d\u5efa\u8bae\u4f7f\u7528delete \u4e0d\u52a0where\u6761\u4ef6\uff0c\u56e0\u4e3a\u5728\u8868\u6570\u636e\u91cf\u5f88\u5927\u7684\u60c5\u51b5\u4e0b\uff0c\u6267\u884c\u975e\u5e38\u6162\uff0c\u4e14\u4f1a\u5bfc\u81f4\u4e25\u91cd\u7684MySQL\u4e3b\u4ece\u590d\u5236\u5ef6\u8fdf\u3002\u5efa\u8bae\u4f7f\u7528truncate table table_name; \u8fdb\u884c\u5168\u8868\u6570\u636e\u5220\u9664\u3002\n<\/div>\n

    \n

    <\/h2>\n

    MySQL\u63d2\u5165\u6570\u636einsert<\/h2>\n<\/div>\n
    \n
    \n
    \nMySQL \u4f7f\u7528 insert into \u8bed\u6cd5\u6765\u5411\u8868\u4e2d\u63d2\u5165\u6570\u636e\uff0c\u4e0b\u9762\u6765\u4ecb\u7ecd\u51e0\u79cd\u5e38\u89c1\u7684MySQL \u63d2\u5165\u6570\u636e\u7684\u7528\u6cd5\u3002<\/p>\n
    \u4e00\u3001insert into values \u8bed\u6cd5<\/h5>\n

    \u8bed\u6cd5\uff1a<\/strong>
    \ninsert int table_name (field1,field2,…fieldN) values (value1,value2,…valueN);
    \n\u793a\u4f8b\uff1a<\/strong>
    \ninsert into table_name(name, age) values(\\’Tom\\’, 20);
    \n\u4e00\u6761SQL\u63d2\u5165\u591a\u6761\u8bb0\u5f55\uff1a<\/strong>
    \ninsert into table_name(name, age) values(\\’Tom\\’, 20), (\\’Bill\\’, 21);
    \n\u4e0d\u6307\u5b9a\u5b57\u6bb5\u540d\u79f0\uff1a<\/strong>
    \ninsert into table_name values(\\’Tom\\’, 20), (\\’Bill\\’, 21);;<\/p>\n

    \u4e8c\u3001insert into select<\/h5>\n

    \u8bed\u6cd5\uff1a<\/strong>
    \ninsert into table_name (field1,field2,…fieldN) select value1,value2,…valueN;
    \n\u793a\u4f8b\uff1a<\/strong>
    \ninsert into table_name(name,age) select \\’Tom\\’, 20;
    \n\u4e0d\u6307\u5b9a\u5b57\u6bb5\u540d\u79f0\uff1a<\/strong>
    \ninsert into table_name select \\’Tom\\’, 20;\n<\/div>\n

    \n

    <\/h2>\n

    MySQL\u521b\u5efa\u5220\u9664\u8868<\/h2>\n<\/div>\n
    \n
    \n
    \n\u8868\u662f\u5173\u7cfb\u578b\u6570\u636e\u5e93\u7684\u6838\u5fc3\uff0c\u901a\u5e38\u4e00\u4e2a\u8868\u5305\u62ec\u5b57\u6bb5\u3001\u4e3b\u952e\u3001\u7d22\u5f15\u7b49\u7b49\uff0c\u4e0b\u9762\u5c06\u4ecb\u7ecd\u5982\u4f55\u5728MySQL\u4e2d\u521b\u5efa\u3001\u5220\u9664\u8868\u3002<\/p>\n
    \u4e00\u3001\u521b\u5efa\u8868\uff1a<\/h5>\n

    \u521b\u5efa\u8868\u793a\u4f8b\u5982\u4e0b\uff1a
    \nCREATE TABLE tb (
    \nid int(11) NOT NULL AUTO_INCREMENT,
    \nname varchar(50) DEFAULT NULL,
    \nage int(11) NOT NULL,
    \nPRIMARY KEY (id),
    \nKEY idx_name(name)
    \n) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    \n\u5982\u679c\u8868\u5df2\u7ecf\u5b58\u5728\uff0c\u5219\u4f1a\u62a5\u9519\uff0c\u52a0\u4e0a if not exists \u8bed\u6cd5\u53ef\u4ee5\u907f\u514d\u62a5\u9519\uff0c\u8868\u793a\u53ea\u6709\u5728\u8868\u4e0d\u5b58\u5728\u7684\u6761\u4ef6\u4e0b\u8fdb\u884c\u521b\u5efa\u3002\u793a\u4f8b\u5982\u4e0b\uff1a
    \nCREATE TABLE IF NOT EXISTS tb (
    \nid int(11) NOT NULL AUTO_INCREMENT,
    \nname varchar(50) DEFAULT NULL,
    \nage int(11) NOT NULL,
    \nPRIMARY KEY (id),
    \nKEY idx_name(name)
    \n) ENGINE=InnoDB DEFAULT CHARSET=utf8;<\/p>\n

    \u4e8c\u3001\u5220\u9664\u8868\uff1a<\/h5>\n

    \u5220\u9664\u8868\u793a\u4f8b\u5982\u4e0b\uff1a
    \ndrop table tb;
    \n\u5220\u9664\u8868\u4e5f\u53ef\u4ee5\u4f7f\u7528if exists\u8bed\u6cd5\uff0c\u6765\u907f\u514d\u5220\u9664\u4e00\u4e2a\u4e0d\u5b58\u5728\u7684\u8868\u65f6\u62a5\u9519\u3002\u793a\u4f8b\u5982\u4e0b\uff1a
    \ndrop table if exists tb;\n<\/p><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

    MySQL\u4fee\u6539\u8868\u540d\u79f0 MySQL\u63d0\u4f9b\u4fee\u6539\u8868\u540d\u79f0\u8bed\u6cd5\u5982\u4e0b\uff1a rename table tb to tb1; al …<\/p>\n

    MySQL \u8868\u64cd\u4f5c<\/span> \u67e5\u770b\u5168\u6587 »<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[90,88],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"MySQL\u4fee\u6539\u8868\u540d\u79f0 MySQL\u63d0\u4f9b\u4fee\u6539\u8868\u540d\u79f0\u8bed\u6cd5\u5982\u4e0b\uff1a rename table tb to tb1; al…","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2026"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2026"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/2026\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2026"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2026"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2026"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}