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alter table student drop column tel go ▓▓ 添加、删除约束 --添加新列、约束 alter table student add number varchar(20) null constraint no_uk unique; --增加主键 alter table student add constraint pk_id primary key(id); --添加外键约束 alter table student add constraint fk_cid foreign key (...
(3)alert table 表名 add constraint DF_字段 default (默认值) for 字段 (4)alert table 表名 add constraint CK_字段 check ( 字段 between 15 and 40 ) (5)alert table 子表名 add constraint FK_子表字段 foreign key (子表字段) references 主表名(主表字段) Alert table 表名 drop constraint ...
If it is T-SQL, checks are done like this IF EXISTS (SELECT 1 from sys.objects where name = 'CUSTOMER_RICH_CONTACTS_RO1') ALTER TABLE MCCOYS.CUSTOMER_RICH_CONTACTS DROP CONSTRAINT CUSTOMER_RICH_CONTACTS_RO1 Gail Shaw Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci) ...
I don't like these, and if you also don't like them, then you might try new DROP IF EXISTS (a.k.a. DIE :) ) statements in SQL Server 2016.From SQL Server 2016 CTP3 you can use new DIE statements instead of big IF wrappers, e.g.:...
In SQL Server 2014 and older, you can use the below method to do the same: 1 2 3 4 IF EXISTS (SELECT 1 FROM sys.objects WHERE object_id = OBJECT_ID(N'unUserID') AND type = N'UQ') ALTER TABLE MyTecBitsUsers DROP CONSTRAINT unUserID ...
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci) SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability We walk in the dark places no others will enter We stand on the bridge and no one may pass ...
Option 4 – DROP TABLE IF EXISTS (SQL Server 2016 and up) The previous T-SQL examples will work in all supported versions. However, SQL Server 2016 introduced a simpler way of dropping a table with DROP IF EXISTS. Instead of having to look and see if whether or not the table exists ...
Alter Stored Procedure is taking huge time in sql server Alter Table Add Column if Not Exists to update Schema Modification Script Alter Table add Column - How do you add a column after say the second column Alter table add constraint primary key clustered identity(1,1) ALTER TABLE ALTER COL...
-- DIE in SQL Server 2016 BEGIN DROP TABLE IF EXISTS [HumanResource].[Department] END Another benefit of DIE clause it can easily jam with ALTER Statement. Here is quick example ALTER TABLE DIE_TESTING DROP CONSTRAINT IF EXISTS DIE_ID_PK1; ...