将log表改名为action_log 添加备注(comment)字段,数据类型为varchar(70) time字段名改为actionTime,数据类型改为DATETIME 删除备注(comment)字段 二、设置主外键约束 添加主键语法: ALTER TABLE 表名 ADD CONSTRAINT 主键名 PRIMARY KEY 表名(主键字段); 添加外键语法: ALTER TABLE 表名 ADD CONSTRAINT 外键名 FORE...
-> address VARCHAR(255) DEFAULT'地址不详'COMMENT'地址', -> bomData DATETIME COMMENT'出生年月', -> email VARCHAR(50) COMMENT'邮件帐号', -> identityCard VARCHAR(18) UNIQUE KEY COMMENT'身份证号' -> ); Query OK, 0 rows affected (0.04 sec) 7.3查看表 创建完表之后,如果需要查看一下表式否...
Entity SQL queries can contain comments. Two dashes (--) start a comment line.複製 -- text_of_comment Argumentstext_of_comment Is the character string that contains the text of the comment.ExampleThe following Entity SQL query demonstrates how to use comments. The query is based on the ...
提交数据有三种类型:显式提交、隐式提交及自动提交。下面分 别说明这三种类型。 (1) 显式提交 用COMMIT命令直接完成的提交为显式提交。其格式为: SQL>COMMIT; (2) 隐式提交 用SQL命令间接完成的提交为隐式提交。这些命令是: ALTER,AUDIT,COMMENT,CONNECT,CREATE,DISCONNECT,DROP, EXIT,GRANT,NOAUDIT,QUIT,REVOK...
Define Comment (SQL). Comment (SQL) synonyms, Comment (SQL) pronunciation, Comment (SQL) translation, English dictionary definition of Comment (SQL). abbreviation for structured query language: a computer programming language used for database management
(Re)set the current CacheMode in effect for this query. NativeQuery<T> setCacheRegion(String cacheRegion) Deprecated. Set the name of the cache region where query results should be cached (if cached at all). NativeQuery<T> setComment(String comment) Deprecated. Set the comment for this...
SQL(Structured Query Language)是用于操作数据库的语言。一个博客有许多网站,一个游戏要储存许多游戏的账号密码,这些都离不开数据库操作。 关系型数据库与NoSQL 关系型数据库就是一个表格,每一个横行就是每一条数据,每一个纵列就是每条数据有哪些信息: ...
text_of_commentIs the character string that contains the text of the comment. Example The following Entity SQL query demonstrates how to use comments. The query is based on the AdventureWorks Sales Model. To compile and run this query, follow these steps: ...
SQL是 Structured Query Language 的缩写,汉语翻译为结构化查询语言,是用来操作关系型数据库的编程语言,定义了一套操作关系型数据库统一标准。 关系型数据库(RDBMS)是指建立在关系模型基础上,由多张相互连接的二维表组成的数据库。而所谓二维表,指的是由行和列组成的表,就类似于Excel表格数据,有表头、有列、有行...
进行查询 mysql> call mytest('zhangsan'); Empty set (0.00 sec) Query OK, 0 rows affected (0.00 sec) mysql> call mytest('lisi'); +---+---+ | name | score | +---+---+ | lisi | 98.00 | +---+---+ 1 row in set (0.00 sec) Query OK, 0 rows affected (0.00 sec) (5...