Question

SQL 判断触发器不存在则执行创建触发器语句 怎么过不去 一直报错

if exists (select * from sysobjects where id=object_id(N'delpoints') and objectproperty(id,N'IsTrigger')=2)
begin
go
CREATE TRIGGER delpoints ON GHXH_Customer AFTER UPDATE AS BEGIN update GHXH_Customer set points = 0 where name like '%零售顾客%' END
end

Answer 1

create trigger语句必须单独放在一个查询里执行才可以，前边不能有任何其他语句。你在create trigger之前放了go我想就是为了让它在单独的查询中执行，但是exists就不起作用了，而且go之前的begin和最后的end是在两个批查询中，本身就不能配对，语法就有问题。exists用法也不对，应该是not exists，objectproperty用法也错了。

如果楼主想实现判断触发器不存在则创建，那么，创建触发器的语句就得放在动态语句里来执行了

if not exists (select * from sysobjects where id=object_id(N'delpoints') and objectproperty(object_id('delpoints'),N'IsTrigger')=1)
begin
    exec ('CREATE TRIGGER delpoints ON GHXH_Customer AFTER UPDATE AS BEGIN update GHXH_Customer set points = 0 where name like ''%零售顾客%'' END')
end

Answer 2

把等于改为等于1 这个是布尔型的 怎么会有2
触发器写的也有问题