2.1 \u6982\u8ff0<\/span><\/p>\n SQL\uff1aStructure Query Language\uff08\u7ed3\u6784\u5316\u67e5\u8be2\u8bed\u8a00\uff09\uff0cSQL\u88ab\u7f8e\u56fd\u56fd\u5bb6\u6807\u51c6\u5c40\uff08ANSI\uff09\u786e\u5b9a\u4e3a\u5173\u7cfb\u578b\u6570\u636e\u5e93\u8bed\u8a00\u7684\u7f8e\u56fd\u6807\u51c6\uff0c\u540e\u6765\u88ab\u56fd\u9645\u5316\u6807\u51c6\u7ec4\u7ec7\uff08ISO\uff09\u91c7\u7eb3\u4e3a\u5173\u7cfb\u6570\u636e\u5e93\u8bed\u8a00\u7684\u56fd\u9645\u6807\u51c6\u3002<\/p>\n \u5404\u6570\u636e\u5e93\u5382\u5546\u90fd\u652f\u6301ISO\u7684SQL\u6807\u51c6\uff0c(\u666e\u901a\u8bdd)<\/p>\n \u5404\u6570\u636e\u5e93\u5382\u5546\u5728\u6807\u51c6\u7684\u57fa\u7840\u4e0a\u505a\u4e86\u81ea\u5df1\u7684\u6269\u5c55\uff0c(\u65b9\u8a00)<\/p>\n SQL \u662f\u4e00\u79cd\u6807\u51c6\u5316\u7684\u8bed\u8a00\uff0c\u5b83\u5141\u8bb8\u4f60\u5728\u6570\u636e\u5e93\u4e0a\u6267\u884c\u64cd\u4f5c\uff0c\u5982\u521b\u5efa\u6570\u636e\u5e93\u3001\u8868\u7b49\u7b49\uff0c\u67e5\u8be2\u5185\u5bb9\uff0c\u66f4\u65b0\u5185\u5bb9\uff0c\u5e76\u5220\u9664\u6761\u76ee\u7b49\u64cd\u4f5c\u3002<\/p>\n Create, Read, Update, and Delete \u901a\u5e38\u79f0\u4e3aCRUD\u64cd\u4f5c\u3002<\/p>\n 2.2 SQL\u8bed\u53e5\u5206\u7c7b<\/span><\/strong><\/p>\n MySQL\u7684\u4f7f\u7528\u6ce8\u610f\uff1a<\/p>\n sql\u8bed\u53e5\u4ee5 ; \u7ed3\u5c3e\u3002<\/p>\n MySQL\u6ce8\u91ca\uff1a\uff081\uff09#\u5f00\u5934 \uff082\uff09–\u7a7a\u683c \u5f00\u5934 \uff083\uff09\/* \u591a\u884c\u6ce8\u91ca *\/<\/p>\n 2.3 DDL\u64cd\u4f5c\u6570\u636e\u5e93<\/span><\/strong><\/p>\n \u7cfb\u7edf\u9ed8\u8ba4\u6570\u636e\u5e93\uff1a<\/p>\n information_schema\uff1a<\/p>\n mysql\uff1a\u8fd9\u4e2a\u662fmysql\u7684\u6838\u5fc3\u6570\u636e\u5e93,\u4e3b\u8981\u8d1f\u8d23\u5b58\u50a8\u6570\u636e\u5e93\u7684\u7528\u6237\u3001\u6743\u9650\u8bbe\u7f6e\u3001\u5173\u952e\u5b57\u7b49mysql\u81ea\u5df1\u9700\u8981\u4f7f\u7528\u7684\u63a7\u5236\u548c\u7ba1\u7406\u4fe1\u606f\uff0c\u4e0d\u53ef\u4ee5\u5220\u9664\u3002<\/p>\n performance_schema\uff1a\u6027\u80fd\u4f18\u5316\u7684\u6570\u636e\u5e93<\/span><\/p>\n test:\u8fd9\u4e2a\u662f\u5b89\u88c5\u65f6\u5019\u521b\u5efa\u7684\u4e00\u4e2a\u6d4b\u8bd5\u6570\u636e\u5e93\uff0c\u548c\u5b83\u7684\u540d\u5b57\u4e00\u6837\uff0c\u662f\u4e00\u4e2a\u5b8c\u5168\u7684\u7a7a\u6570\u636e\u5e93\uff0c\u6ca1\u6709\u4efb\u4f55\u8868\uff0c\u53ef\u4ee5\u5220\u9664\u3002<\/span><\/p>\n \u521b\u5efa\u6570\u636e\u5e93<\/span><\/strong>\uff1a<\/p>\n CREATE DATABASE\u8bed\u53e5\u7528\u4e8e\u521b\u5efa\u65b0\u7684\u6570\u636e\u5e93\uff1a<\/p>\n \u8bed\u6cd5\uff1a<\/p>\n 2\u67e5\u770b<\/p>\n \u67e5\u770b\u5f53\u524d\u6570\u636e\u5e93\u670d\u52a1\u5668\u4e2d\u7684\u6240\u6709\u6570\u636e\u5e93SQL> SHOW DATABASES;<\/span><\/p>\n \u67e5\u770b\u524d\u9762\u521b\u5efa\u7684mydb2\u6570\u636e\u5e93\u7684\u5b9a\u4e49\u4fe1\u606fSQL> ShOW CREATE DATABASE mydb2;<\/span><\/p>\n 3\u4fee\u6539<\/p>\n \u67e5\u770b\u670d\u52a1\u5668\u4e2d\u7684\u6570\u636e\u5e93\uff0c\u5e76\u628amydb2\u7684\u5b57\u7b26\u96c6\u4fee\u6539\u4e3autf8;<\/p>\n 4\u5220\u9664<\/p>\n \u8bed\u6cd5\uff1aDROP DATABASE [IF EXISTS] db_name<\/p>\n 5\u5176\u4ed6\u8bed\u53e5<\/p>\n \u67e5\u770b\u5f53\u524d\u4f7f\u7528\u7684\u6570\u636e\u5e93<\/p>\n \u5207\u6362\u6570\u636e\u5e93<\/p>\n \u9000\u51faMySQL<\/p>\n 2.4 DDL\u64cd\u4f5c\u8868<\/span><\/strong><\/p>\n CREATE TABLE\u8bed\u53e5\u7528\u4e8e\u521b\u5efa\u65b0\u8868\u3002<\/p>\n \u8bed\u6cd5\uff1a<\/p>\n CREATE TABLE [IF NOT EXISTS] \u8868\u540d( \u793a\u4f8b\uff1a<\/span><\/p>\n \u6ce8\u610f\uff1a\u6570\u636e\u5e93\u540d\u3001\u8868\u540d\u3001\u5b57\u6bb5\u540d\u53ef\u4ee5\u4f7f\u7528\u53cd\u52fe\u53f7` \u62ec\u4f4f\uff0c\u4e5f\u53ef\u4ee5\u4e0d\u62ec\u3002\u5982\u679cSQL\u5173\u952e\u5b57\u4e00\u822c\u8981\u62ec\u4f4f\u3002<\/span><\/p>\n \u5e38\u7528\u6570\u636e\u7c7b\u578b<\/span><\/strong>\uff1a<\/span><\/p>\n int\uff1a\u6574\u578b\uff084\u4e2a\u5b57\u8282\uff09<\/p>\n double\uff1a\u6d6e\u70b9\u578b\uff088\u4e2a\u5b57\u8282\uff09\uff0c\u8fd1\u4f3c\u503c<\/p>\n \u4f8b\u5982double(5,2)\u8868\u793a\u6700\u591a5\u4f4d\uff0c\u5176\u4e2d\u5fc5\u987b\u67092\u4f4d\u5c0f\u6570\uff0c\u5373\u6700\u5927\u503c\u4e3a999.99<\/p>\n decimal\uff1a\u7cbe\u786e\u6570\u503c\u6570\u636e\uff0c\u6700\u5927\u4f4d\u6570\u53ef\u4ee5\u662f65<\/p>\n \u4f8b\u5982decimal(5,2)\u80fd\u591f\u5b58\u50a8\u5177\u6709\u4e94\u4f4d\u6570\u548c\u4e24\u4f4d\u5c0f\u6570\u7684\u4efb\u4f55\u503c\uff0c\u56e0\u6b64\u53ef\u4ee5\u5b58\u50a8\u8303\u56f4\u4e3a<\/p>\n -999.99\u81f3999.99\u3002<\/p>\n char\uff1a\u56fa\u5b9a\u957f\u5ea6\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b char(10) ‘aaa ‘ \u56fa\u5b9a10\u4e2a\u5b57\u7b26\uff0c\u4e0d\u8db3\u8865\u7a7a\u683c\uff0c \u957f\u5ea60-255<\/p>\n \u7f3a\u70b9\uff1a\u6d6a\u8d39\u7a7a\u95f4\uff0c\u4f18\u70b9:\u67e5\u8be2\u901f\u5ea6\u5feb<\/p>\n varchar\uff1a\u53ef\u53d8\u957f\u5ea6\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b varchar(10) ‘aaa’ \u6700\u591a\u5b58\u50a810\u4e2a\u5b57\u7b26<\/p>\n \u7f3a\u70b9\uff1a\u67e5\u8be2\u901f\u5ea6\u6162\uff0c\u4f18\u70b9\uff1a\u8282\u7701\u7a7a\u95f4<\/p>\n text\uff1a\u5927\u6587\u672c\u5b57\u7b26\u4e32\u7c7b\u578b\uff1b\u6709\u5b57\u7b26\u7f16\u7801\uff0c\u5b58\u50a8\u6bd4\u8f83\u5927\u7684\u6587\u672c\u6570\u636e\u3002<\/p>\n blob\uff1aBinary Large Object\u4e8c\u8fdb\u5236\u5927\u5bf9\u8c61\u6570\u636e\uff1b\u53ef\u4ee5\u5b58\u50a8\u56fe\u7247\u3001\u97f3\u9891\u3001\u89c6\u9891<\/p>\n date\uff1a\u65e5\u671f\u7c7b\u578b\uff0c\u683c\u5f0f\u4e3a\uff1ayyyy-MM-dd\uff1b<\/p>\n time\uff1a\u65f6\u95f4\u7c7b\u578b\uff0c\u683c\u5f0f\u4e3a\uff1ahh:mm:ss<\/p>\n timestamp\uff1a\u65f6\u95f4\u6233\u7c7b\u578b yyyy-MM-dd hh:mm:ss \u4f1a\u81ea\u52a8\u8d4b\u503c<\/p>\n datetime:\u65e5\u671f\u65f6\u95f4\u7c7b\u578b yyyy-MM-dd hh:mm:ss<\/p>\n \u5e38\u7528\u7ea6\u675f<\/span><\/strong>\uff1a<\/p>\n \u4e3b\u952e\u7ea6\u675f\uff1aprimary key (\u4fdd\u8bc1\u6570\u636e\u552f\u4e00\u6027),\u4e0d\u80fd\u91cd\u590d\uff0c\u4e0d\u80fd\u4e3anull<\/p>\n \u552f\u4e00\u7ea6\u675f\uff1aunique [key],\u4e0d\u80fd\u91cd\u590d\uff0c\u53ef\u4ee5\u4e3anull<\/p>\n \u975e\u7a7a\u7ea6\u675f\uff1anot null<\/p>\n \u9ed8\u8ba4\u7ea6\u675f\uff1adefault<\/p>\n \u5916\u952e\u7ea6\u675f\uff1aforeign key<\/p>\n \u81ea\u52a8\u589e\u957f\uff1aauto_increment<\/p>\n DROP TABLE\u8bed\u53e5\u7528\u4e8e\u5220\u9664\u73b0\u6709\u8868\u3002<\/p>\n \u8bed\u6cd5\uff1a DROP TABLE [IF EXISTS] table_name;<\/p>\n SQL> DROP TABLE table_name;<\/p>\n \u5f53\u524d\u6570\u636e\u5e93\u4e2d\u7684\u6240\u6709\u8868<\/p>\n SHOW TABLES;<\/p>\n \u67e5\u770b\u8868\u7684\u5b57\u6bb5\u4fe1\u606f<\/p>\n DESC student;<\/p>\n \u5728\u4e0a\u9762\u5b66\u751f\u8868\u7684\u57fa\u7840\u4e0a\u589e\u52a0\u4e00\u4e2aimage\u5217\u3002<\/p>\n ALTER TABLE student ADD image blob;<\/p>\n \u4fee\u6539address\u5217\uff0c\u4f7f\u5176\u957f\u5ea6\u4e3a60\u3002<\/p>\n ALTER TABLE student MODIFY address varchar(60);<\/p>\n \u5220\u9664image\u5217,\u4e00\u6b21\u53ea\u80fd\u5220\u4e00\u5217\u3002<\/p>\n ALTER TABLE student DROP image;<\/p>\n \u8868\u540d\u6539\u4e3auser\u3002<\/p>\n RENAME TABLE student TO user;<\/p>\n \u67e5\u770b\u8868\u7684\u521b\u5efa\u7ec6\u8282<\/p>\n SHOW CREATE TABLE user;<\/p>\n \u4fee\u6539\u8868\u7684\u5b57\u7b26\u96c6\u4e3agbk<\/p>\n ALTER TABLE user CHARACTER SET gbk;<\/p>\n \u5217\u540dname\u4fee\u6539\u4e3ausername<\/p>\n ALTER TABLE user CHANGE name username varchar(100);<\/p>\n 2.5 DML\u64cd\u4f5c\uff08\u91cd\u8981\uff09<\/span><\/strong><\/p>\n DML\u662f\u5bf9\u8868\u4e2d\u7684\u6570\u636e\u8fdb\u884c\u589e\u3001\u5220\u3001\u6539\u7684\u64cd\u4f5c\u3002\u4e0d\u8981\u4e0eDDL\u6df7\u6dc6\u4e86\u3002<\/p>\n \u4e3b\u8981\u5305\u62ec\uff1aINSERT \u3001 DELETE\u3001UPDATE<\/p>\n \u5c0f\u77e5\u8bc6\uff1a<\/p>\n \u5728mysql\u4e2d\uff0c\u5b57\u7b26\u4e32\u7c7b\u578b\u548c\u65e5\u671f\u7c7b\u578b\u90fd\u8981\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n \u7a7a\u503c\uff1anull\u3002<\/p>\n \uff081\uff09\u63d2\u5165\u64cd\u4f5c\uff1aINSERT:<\/p>\n \u8bed\u6cd5\uff1a INSERT INTO \u8868\u540d\uff08\u5217\u540d1\uff0c\u5217\u540d2 …\uff09VALUES(\u5217\u503c1\uff0c\u5217\u503c2…);<\/p>\n \u6ce8\u610f\uff1a\u5217\u540d\u4e0e\u5217\u503c\u7684\u7c7b\u578b\u3001\u4e2a\u6570\u3001\u987a\u5e8f\u8981\u4e00\u4e00\u5bf9\u5e94\u3002<\/p>\n \u53ef\u4ee5\u628a\u5217\u540d\u5f53\u505ajava\u4e2d\u7684\u5f62\u53c2\uff0c\u628a\u5217\u503c\u5f53\u505a\u5b9e\u53c2\u3002<\/p>\n \u53c2\u6570\u4e0d\u8981\u8d85\u51fa\u5217\u5b9a\u4e49\u7684\u957f\u5ea6\u3002<\/p>\n \u5982\u679c\u63d2\u5165\u7a7a\u503c\uff0c\u8bf7\u4f7f\u7528null<\/p>\n \u63d2\u5165\u7684\u65e5\u671f\u548c\u5b57\u7b26\u4e00\u6837\uff0c\u90fd\u4f7f\u7528\u5355\u5f15\u53f7\u62ec\u8d77\u6765\u3002<\/p>\n SQL> CREATE TABLE student \u4e00\u6b21\u6dfb\u52a0\u4e00\u6761\u6570\u636e<\/p>\n INSERT INTO student(id,name,age,address) values (1,’zhangsan’,20,’\u5317\u4eac\u6d77\u6dc0’); \u4e00\u6b21\u6dfb\u52a0\u591a\u6761\u6570\u636e<\/p>\n INSERT INTO student(id,name,age,address) values (4,’\u66f9\u64cd’,27,’\u5317\u4eac\u6d77\u6dc0’), \u601d\u8003\uff1a\u547d\u4ee4\u884c\u4e2d\u4e3a\u4ec0\u4e48\u4e0d\u80fd\u6dfb\u52a0\u4e2d\u6587\u6570\u636e\uff1f<\/p>\n \u547d\u4ee4\u884c\u7a97\u53e3\u9ed8\u8ba4\u5b57\u7b26\u96c6\u662fGBK\u3002MySQL\u9ed8\u8ba4\u662fUTF8<\/p>\n \u5c0f\u77e5\u8bc6\uff1a<\/p>\n \u67e5\u770b\u6570\u636e\u5e93\u7f16\u7801\u7684\u5177\u4f53\u4fe1\u606f<\/p>\n Show variables like \u2018character%\u2019;<\/p>\n \u4e34\u65f6\u66f4\u6539\u5ba2\u6237\u7aef\u548c\u670d\u52a1\u5668\u7ed3\u679c\u96c6\u7684\u7f16\u7801<\/p>\n Set character_set_client=gbk; \u6216\u8005<\/p>\n SET NAMES \u2018gbk\u2019; \/\/ client connection results<\/p>\n \uff082\uff09\u4fee\u6539\u64cd\u4f5c\uff1aUPDATE:<\/p>\n \u8bed\u6cd5\uff1aUPDATE \u8868\u540d SET \u5217\u540d1=\u5217\u503c1,\u5217\u540d2=\u5217\u503c2 … WHERE \u5217\u540d=\u503c<\/p>\n \u7ec3\u4e60\uff1a<\/p>\n \u5c06\u6240\u6709\u5b66\u751f\u7684\u5e74\u9f84\u4fee\u6539\u4e3a25\u3002<\/p>\n UPDATE student SET age=25;<\/p>\n \u5c06id\u4e3a\u20191\u2019\u7684\u5730\u5740\u4fee\u6539\u4e3a\u201c\u6cb3\u5317\u4fdd\u5b9a\u201d\u3002<\/p>\n UPDATE student SET address=’\u6cb3\u5317\u4fdd\u5b9a’ WHERE id=1;<\/p>\n \u5c06\u59d3\u540d\u4e3a\u2019\u66f9\u64cd’\u2019\u7684\u5b66\u751f\u5e74\u9f84\u6539\u4e3a50\uff0c\u5730\u5740\u6539\u4e3a”\u6cb3\u5357\u90d1\u5dde”\u2019\u3002<\/p>\n UPDATE student SET age=50, address=’\u6cb3\u5357\u90d1\u5dde’ WHERE name=’\u66f9\u64cd’;<\/p>\n \u5c06\u6240\u6709\u5b66\u751f\u7684\u5e74\u9f84\u52a05\u5c81\u3002<\/p>\n UPDATE student SET age=age+5;<\/p>\n \uff083\uff09\u5220\u9664\u64cd\u4f5c\uff1aDELETE<\/p>\n \u8bed\u6cd5 \uff1a<\/p>\n DELETE FROM \u8868\u540d \u3010WHERE \u5217\u540d=\u503c\u3011<\/p>\n \u7ec3\u4e60 \uff1a<\/p>\n \u5220\u9664\u8868\u4e2d\u540d\u79f0\u4e3a\u2019zhangsan\u2019\u7684\u8bb0\u5f55\u3002<\/p>\n DELETE FROM student WHERE name=\u2018zhangsan\u2019;<\/p>\n \u5220\u9664\u8868\u4e2d\u6240\u6709\u8bb0\u5f55\u3002<\/p>\n DELETE FROM emp;<\/p>\n \u4f7f\u7528truncate\u5220\u9664\u8868\u4e2d\u8bb0\u5f55\u3002(\u5148\u628a\u8868\u5220\u9664\uff0c\u7136\u540e\u518d\u521b\u5efa\u7a7a\u8868)<\/p>\n TRUNCATE TABLE emp;<\/p>\n DELETE \u5220\u9664\u8868\u4e2d\u7684\u6570\u636e\uff0c\u8868\u7ed3\u6784\u8fd8\u5728;\u5220\u9664\u540e\u7684\u6570\u636e\u4f7f\u7528\u65e5\u5fd7\u53ef\u4ee5\u627e\u56de\u3002<\/p>\n TRUNCATE \u5220\u9664\u662f\u628a\u8868\u76f4\u63a5DROP\u6389\uff0c\u7136\u540e\u518d\u521b\u5efa\u4e00\u4e2a\u540c\u6837\u7684\u65b0\u8868\u3002<\/p>\n TRUNCATE \u5220\u9664\u7684\u6570\u636e\u4e0d\u80fd\u627e\u56de\u3002\u6267\u884c\u901f\u5ea6\u6bd4DELETE\u5feb\u3002<\/p>\n 2.6\u5ba2\u6237\u7aef\u5de5\u5177<\/span><\/strong><\/p>\n \u4f7f\u7528\u547d\u4ee4\u867d\u7136\u53ef\u4ee5\u5b8c\u6210\u57fa\u672c\u64cd\u4f5c\uff0c\u4e3a\u4e86\u66f4\u65b9\u4fbf\u7528\u6237\u64cd\u4f5c\u548c\u4f7f\u7528MySQL\u6570\u636e\uff0c\u5e02\u9762\u4e0a\u51fa\u73b0\u5f88\u591a\u7b2c\u4e09\u65b9\u7684\u5ba2\u6237\u7aef\u7ba1\u7406\u5de5\u5177\u6bd4\u5982:SQLyog\u548cNavicat<\/p>\n","protected":false},"excerpt":{"rendered":" 2020Javaweb\u6559\u7a0b\u4e4bSQL\u8bed\u8a00 2.1 \u6982\u8ff0 SQL\uff1aStructure Query Language […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-2347","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2347","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2347"}],"version-history":[{"count":1,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2347\/revisions"}],"predecessor-version":[{"id":2348,"href":"https:\/\/www.9713job.com\/index.php?rest_route=\/wp\/v2\/posts\/2347\/revisions\/2348"}],"wp:attachment":[{"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2347"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2347"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.9713job.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2347"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}\n
show databases; \u00a0 #\u663e\u793a\u5f53\u524dmysql\u4e2d\u7684\u6570\u636e\u5e93<\/span><\/pre>\ninformation_schema\u6570\u636e\u5e93\u662fMySQL\u81ea\u5e26\u7684\uff0c\u5b83\u63d0\u4f9b\u4e86\u8bbf\u95ee\u6570\u636e\u5e93\u5143\u6570\u636e\u7684\u65b9\u5f0f\u3002\u4ec0\u4e48\u662f\u5143\u6570\u636e\u5462\uff1f\u5143\u6570\u636e\u662f\u5173\u4e8e\u6570\u636e\u7684\u6570\u636e\uff0c\u5982\u6570\u636e\u5e93\u540d\u6216\u8868\u540d\uff0c\u5217\u7684\u6570\u636e\u7c7b\u578b\uff0c\u6216\u8bbf\u95ee\u6743\u9650\u7b49\u3002 \u522b\u52a8\uff01<\/span><\/pre>\nCREATE DATABASE [IF NOT EXISTS] \u81ea\u5df1\u8d77\u7684\u8868\u540d<\/span><\/pre>\nSQL> CREATE DATABASE mydb1;<\/span>\r\nSQL> CREATE DATABASE IF NOT EXISTS mydb2 character SET GBK;<\/span>\r\nSQL> CREATE DATABASE mydb3 character SET GBK COLLATE gbk_chinese_ci;<\/span><\/pre>\nSQL> ALTER DATABASE mydb2 character SET utf8;<\/span><\/pre>\nSQL> DROP DATABASE IF EXISTS mydb3;<\/span><\/pre>\nSQL> Select database(); #\u6ca1\u6709\u9009\u62e9\u6570\u636e null<\/span><\/pre>\nSQL> USE mydb2;<\/span><\/pre>\nquit;\u6216exit;\r\n<\/span><\/pre>\n
\n\u200b
\n\u5b57\u6bb51 \u5b57\u6bb5\u7c7b\u578b(\u957f\u5ea6) \u7ea6\u675f,
\n\u200b
\n\u5b57\u6bb52 \u5b57\u6bb5\u7c7b\u578b(\u957f\u5ea6) \u7ea6\u675f,
\n…
\n\u5b57\u6bb5n \u5b57\u6bb5\u7c7b\u578b(\u957f\u5ea6) \u7ea6\u675f
\n\u200b
\n) [charset=utf8];<\/p>\nSQL> CREATE<\/span> TABLE<\/span> IF NOT<\/span> EXISTS student<\/span>\r\n(<\/span>\r\n \u00a0 id INT<\/span> NOT<\/span> NULL<\/span>,<\/span>\r\n \u00a0 name VARCHAR<\/span>(50<\/span>),<\/span>\r\n \u00a0 age INT<\/span>,<\/span>\r\n \u00a0 address VARCHAR<\/span>(100<\/span>)<\/span>\r\n) CHARSET=utf8;<\/span>\r\n\u6216<\/span>\r\nSQL> CREATE<\/span> TABLE<\/span> IF NOT<\/span> EXISTS `student`<\/span>\r\n(<\/span>\r\n \u00a0 `id` INT<\/span> NOT<\/span> NULL<\/span>,<\/span>\r\n \u00a0 `name` VARCHAR<\/span>(50<\/span>),<\/span>\r\n \u00a0 `age` INT<\/span>,<\/span>\r\n \u00a0 `address` VARCHAR<\/span>(100<\/span>)<\/span>\r\n) CHARSET=utf8;<\/span><\/pre>\n
\n(
\nid INT NOT NULL,
\nname VARCHAR(50),
\nage INT,
\naddress VARCHAR(100)
\n);<\/p>\n
\nINSERT INTO student(id,name,age,address) values (2,’lisi’,22,’\u4e0a\u6d77\u6d66\u4e1c’);
\nINSERT INTO student(id,name,age,address) values (3,’wangwu’,23,’\u5317\u4eac\u660c\u5e73’);<\/p>\n
\n(5,’\u5468\u745c’,28,’\u5317\u4eac\u671d\u9633’),
\n(6,’\u8d75\u4e91’,30,’\u5317\u4eac\u5927\u5174’);<\/p>\n
\n\u200b
\nSet character_set_results=gbk;<\/p>\n