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搜索关键字:constraint    ( 810个结果)
Sqlserver 循环表
CREATE TABLE dbo.[User] ( UID BIGINT IDENTITY ,Name VARCHAR(50) NOT NULL ,Pwd VARCHAR(50) NOT NULL ,CONSTRAINT PK_User PRIMARY KEY CLUSTERED (UID) ) O... ...
分类:数据库   时间:2016-12-20 01:13:55    阅读次数:258
SQL 约束
先用设计器创建约束、再用代码创建约束。数据库约束是为了保证数据的完整性(正确性)而实现的一套机制见文件Employee.sql非空约束(选择复选框)主键约束(PK) primary key constraint 唯一且不为空(选中列,右键,设为主键)唯一约束 (UQ)unique constrain ...
分类:数据库   时间:2016-12-20 00:32:08    阅读次数:305
数据库检查约束是否存在
http://stackoverflow.com/questions/2499332/how-to-check-if-a-constraint-exists-in-sql-server Easiest way to check for the existence of a constraint (a ...
分类:数据库   时间:2016-12-16 14:46:28    阅读次数:182
Leetcode 198 House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo ...
分类:其他好文   时间:2016-12-15 07:35:21    阅读次数:255
not empty
参考:Mysql Column constraint as “not empty” / “required” ...
分类:其他好文   时间:2016-12-15 00:54:07    阅读次数:139
oracle建表的时候同时创建主键,外键,注释,约束,索引
--主键create table emp (id number constraint id_pr primary key ,name1 varchar(8));create table emp9 (id number ,name1 varchar(8) ,constraint aba_pr prim ...
分类:数据库   时间:2016-12-12 14:05:21    阅读次数:258
添加、修改表中的字段
添加、修改表中的字段 ALTER TABLE dbo.Table1 ADD Days INT NOT NULL CONSTRAINT DF_Table1_Days DEFAULT (0) ;--添加列,并给定默认值 ALTER TABLE dbo.Table1 ALTER COLUMN Create ...
分类:其他好文   时间:2016-12-06 18:17:18    阅读次数:148
数据库中表内容的删除总结(总有你需要的)
1.对数据库中的表批量清空删除 (慎用) use PL123 EXEC sp_MSForEachTable 'ALTER TABLE ? NOCHECK CONSTRAINT ALL' EXEC sp_MSForEachTable 'ALTER TABLE ? DISABLE TRIGGER ALL ...
分类:数据库   时间:2016-12-05 16:46:52    阅读次数:227
LeetCode 198. House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo ...
分类:其他好文   时间:2016-11-29 22:49:35    阅读次数:202
198. House Robber
You are a professional robber planning to rob houses along a street. Each house has a certain amount of money stashed, the only constraint stopping yo ...
分类:其他好文   时间:2016-11-28 09:26:28    阅读次数:185
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