alter table dbo.employee with check add constraint [FK_employeeno] foreign key ([colorcode]) references dbo.color([colorcode]) 其中的with check /nocheck 的作用: 指定表中的数据是否用新添加的或者重新启用的foregin key 或者check 进行验证. check :对添加验证之前的数据也进行验证检查. nocheck :对添...
constraint使用方法总结 约束名称 添加�的约束类型 (列名) 样例: alter table emp addconstraintppp primary key (id) ———...约束名称 添加�的约束类型 (列名) 样例: alter table emp addconstraintxxx check(age>20) ___...约束名称 约束类型(列名) 例如说能够给ename列加个unique,让ename列的数据不...
一、在已有数据表中,添加一个约束,但不让这个约束使用到已存在的数据中,在执行ALTER TABLE语句添加时使用WITH NOCHECK子句,这样新增的约束就不会去约束已存在的数据,而只会对新增的数据进行约束检查: alter table [tablename] with nochek add constraint [ ck_XXX] check (核查条件) 二、NOCHECK还可以禁用约束,...
专业表进行关联，但是在添加外键的过程中却出现了“Cannot add foreign key constraint” 的问题，也就...
CREATE TABLE dbo.OtherTable ( ID INT PRIMARY KEY IDENTITY(1,1), Blah VARCHAR(100), FieldName AS CAST('This' AS VARCHAR(100)) PERSISTED NOT NULL ) ; ALTER TABLE dbo.OtherTable WITH CHECK ADD CONSTRAINT [FK__OtherTable__Blah] FOREIGN KEY (FieldName, Blah) REFEREN...
ALTER TABLE ORDERS_6 WITH CHECK ADD CONSTRAINT check_ORDERS_6 CHECK (O_ORDERKEY >= 535714275 AND O_ORDERKEY <= 642857124) With the tables set up as described, after SSIS has loaded data into the temporary tables, executing the switch is as simple as this: ...
(15) ) --Table must have a CHECK Constraint ALTER TABLE single_partition WITH CHECK ADD CONSTRAINT CK_single_partition CHECK (col1 > 100) INSERT INTO single_partition VALUES (101,’Description’) INSERT INTO single_partition VALUES (102,’Description’) INSERT INTO single_partition VALUES (103...
The constraint clause. IfConstraintTypeis not DBCONSTRAINTTYPE_CHECK, this must be a null pointer. UpdateRule The update rule (as defined in SQL-92). One of the following values: DBUPDELRULE_NOACTION DBUPDELRULE_CASCADE DBUPDELRULE_SETNULL ...
[GSPoints] WITH CHECK ADD CONSTRAINT [FK_GSPoints_GSPlanarSurfaces_PlanarSurfaceId] FOREIGN KEY([PlanarSurfaceId]) REFERENCES [dbo].[GSPlanarSurfaces] ([Id]) GO ALTER TABLE [dbo].[GSPoints] CHECK CONSTRAINT [FK_GSPoints_GSPlanarSurfaces_PlanarSurfaceId] GO ...
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