ALTER TABLE table_nameA RENAME table_nameB; 修改表的列名 ALTER TABLE table_name CHANGE COLUMN columnA columnB VARCHAR(30) COMMENT 'commentValue'; 修改表的列 ALTER TABLE [dbName.]tableName MODIFY id BIGINT(20) UNSIGNED NOT NULL PRIMARY KEY AUTO_INCREMENT; -- 修改列(数据类型、nullable、pr...
`update_time` datetimeDEFAULTCURRENT_TIMESTAMPONUPDATECURRENT_TIMESTAMPCOMMENT'更新时间',PRIMARYKEY (`id`) ) ENGINE=InnoDBDEFAULTCHARSET=utf8 COMMENT='学生信息表';-- CREATE [ UNIQUE | FULLTEXT ] INDEX index_name ON table_name (index_col_name, ...);createuniqueindex idx_student_idcardontest....
不允许为空、设为自增列、声明为主键 `user_id` int(8) NOT NULL AUTO_INCREMENT PRIMARY "i_p_id" COMMENT '用户ID', -- 用户名称字段:字符串类型、运行为空、默认值为“新用户” `user_name` varchar(255) NULL DEFAULT "新用户" COMMENT '用户名' ) -- 存储...
add|drop|change|modify #[add]最后接first或者after ColumName,没有before #change 可以更改 列名 和 列类型 (只改类型也要把新列名和旧列名写上, 即旧名字写两遍, 只改类型) 1. 2. 3. 4 命令行多行模式 & 纵向模式 多条语句需要执行时,替换分隔符 DELIMITER //,要改回分号执行 DELIMITER ; 在Mysql...
mysql>insert into[tablename](column1,column2,...)values(value1,value2,...);#示例 mysql>insert intostudent(name,school,grade,major,gender)values('lvlv0','software','first year','software engineering',0); 注意:如果插入值刚好与数据表的所有列一一对应,那么可以省略书写插入的指定列,即: ...
ibd'; ERROR 3121 (HY000): The ADD DATAFILE filepath cannot contain circular directory references.mysql> CREATE TABLESPACE ts11 ADD DATAFILE '/data/mysql/log/ts11.ibd'; Query OK, 0 rows affected (10.02 sec)SQL changegroup by 不再支持DESC和ASC，GROUP BY {col_name | expr | positi...
ALTERTABLE表名CONVERTTOCHARACTERSETutf8mb4COLLATEutf8mb4_general_ci; 修改column字符集 ALTERTABLE表名 CHANGE 字段名 字段名 该字段原来的数据类型CHARACTERSETutf8mb4COLLATEutf8mb4_general_ci; 3、MySql插入时间带毫秒 5.1 版本要求 .net framework 4.5.2 ...
(\g)Send command to mysql server.help(\h)Displaythishelp.nopager(\n)Disable pager,print to stdout.notee(\t)Don't write into outfile.pager(\P)SetPAGER[to_pager].Print the query results viaPAGER.print(\p)Print current command.prompt(\R)Change your mysql prompt.quit(\q)Quit mysql....
方法二: 比如查看table_name表中column_name字段中重复的数据,但是不统计,直接打印出来: SELECT column_name FROM table_name WHERE column_name IN ( SELECT column_name FROM table_name GROUP BY column_name HAVING COUNT(*) > 1 ); 1. 2.
Name ="a", Price =1}).ExecuteCommand(); mysqldb.Queryable<Order>().ToList(); sqlServerdb.Queryable<Order>().ToList(); db.CommitTran(); Feature6 : Singleton Pattern Implement transactions across methods publicstaticSqlSugarScope Db =newSqlSugarScope(newConnectionConfig() ...