[英]SQL Server Drop Table
如果你在SQL Server中删除一个包含键,索引,约束等的表,它也会删除它们吗? 我只是想知道我什么时候构建脚本,如果我需要为所有这些脚本创建drop脚本,或者我可以简单地删除表格?
谢谢,
小号
是的,虽然您不能删除另一个表中的外键引用的表。
这是一个删除带有在SQL Server 2008中引用它的外键的表的过程:
create table TA ( AID int identity(1, 1), OtherId int, Name varchar(512), constraint PK_TA primary key (AID))
create table TB ( BID int identity(1, 1), OtherId int, Name varchar(512), constraint PK_TB primary key (BID))
alter table TA add constraint FK_TA_TB foreign key (OtherId) references TB (BID)
alter table TB add constraint FK_TB_TA foreign key (OtherId) references TA (AID)
drop table ta -- doesn't work
drop table tb -- doesn't work
create procedure my_DropTable @tableName varchar(512) as
begin
if OBJECT_ID(@tableName) is null begin print 'OBJECT DOES NOT EXIST' return end
declare @sql nvarchar(max)
while exists (select * from sys.foreign_keys where referenced_object_id = object_id(@tableName))
begin
select @sql = 'ALTER TABLE ' + OBJECT_NAME(parent_object_id) + ' DROP CONSTRAINT ' + OBJECT_NAME(object_id)
from sys.foreign_keys where referenced_object_id = object_id(@tableName)
exec sp_executesql @sql
end
set @sql = 'DROP TABLE ' + @tableName
exec sp_executesql @sql
end
exec my_DropTable 'TA'
exec my_DropTable 'TB'
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