`pid` int COMMENT 'parent id', `name` varchar(100) NOT NULL, PRIMARY KEY (`id`) ) ENGINE = InnoDB; CREATE TRIGGER pid_insert_check BEFORE INSERT ON department FOR EACH ROW BEGIN IF (NEW.pid <> 0 AND NEW.pid NOT IN (select id from department)) THEN signal sqlstate '45000' set ...
您可以使用 SQL Server Management Studio 或 Transact-SQL,在資料表中建立檢查條件約束,以指定 SQL Server 中一或多個資料行可接受的資料值。 如需新增資料行條件約束的詳細資訊,請參閱ALTER TABLE column_constraint。 如需詳細資訊,請參閱Unique Constraints and Check Constraints。
If you want to count any string consisting entirely of spaces as empty
在“CHECK 约束表达式”对话框中,键入 CHECK 约束的 SQL 表达式。 例如,若要将SellEndDate表的Product列中的条目限制为大于等于SellStartDate列中的日期的值,或者为NULL值,则键入: SQL SellEndDate >= SellStartDate 或者,如果要求zip列中的项为 5 位数,请键入: ...
C# and SQL Database Question on /r /t /n (Escape Characters or Sequences) C# asp:listbox Add Style to List Items from Code Behind. C# Check and create DNS Record on MS DNS Server c# check date is weekend or weekday C# code for last week begin date and last week end date c# cod...
SQL Server Azure SQL 托管实例 确定是在复制触发器的上下文中调用用户定义的触发器还是存储过程,该触发器用于立即更新订阅。 该存储过程在发布服务器的发布数据库中或在订阅服务器的订阅数据库中执行。 Transact-SQL 语法约定 语法 syntaxsql复制 sp_check_for_sync_trigger[ @tabid = ] tabid [ , [ @trigger_...
CheckObjectStateImpl 检查SqlSmoObject 的状态。 (从 SqlSmoObject 继承。) CheckTextCorectness Checks text for correctness against the parameters. (从 ScriptNameObjectBase 继承。) CheckTextModeSupport Checks mode of support. (从 ScriptNameObjectBase 继承。) CheckVersion100 检查SQL Server 的版本是否为...
time it's run as long as the table contents haven't changed. See my post on this for more...
[root@localhost~]# mysqlshow test tDatabase:test Table:t+---+---+---+---+---+---+---+---+---+|Field|Type|Collation|Null|Key|Default|Extra|Privileges|Comment|+---+---+---+---+---+---+---+---+---+|id|int||YES|...
在数据库中执行以下sql 出错SQL,点击展开 -- sql #0 -- data: 0 140 0 ; level: 0 create table T_U85WA ( C_G19F int4 , C_S bool not null , C_HY2D int4 , C_JOJBIQ float4 , C_ET24 float4 , C_K8DM bool , C_XJKBW9L8 int4 , ...