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根据多条件查询临时表想得到不同结果集的方法 - 站长搜索
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根据多条件查询临时表想得到不同结果集的方法

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2022-09-23 16:53:56 转载来源: 网络整理/侵权必删

当我写下如下sql语句时,我得到了输入@c参数时想得到的结果集。select*from@tbtwheret.idin(selectidfromtbwheref=@c)但如果有@a,@b,@c,而它们分别想从@tb中得到不同的结果集,例如复制代码代码如下:if@aisnotnullbegin--得到@a想得到的endif@bisnotnullbegin--得到@b想得到的endif@cisnotnullbegin--得到@c想得到的end这样做好像没什么问题,但如果@a和@b是一起的,甚至是@a,@b,@c,@d,@e,@f等等N多种条件组合,这样就不好办了

当我写下如下sql语句时,我得到了输入@c参数时想得到结果集。
select * from @tb t where t.id in (select id from tb where f = @c)
但如果有@a,@b,@c,而它们分别想从@tb中得到不同的结果集,例如
复制代码 代码如下:

if @a is not null
begin
--得到@a想得到的
end
if @b is not null
begin
--得到@b想得到的
end
if @c is not null
begin
--得到@c想得到的
end

这样做好像没什么问题,但如果@a和@b是一起的,甚至是@a,@b,@c,@d,@e,@f等等N多种条件组合,这样就不好办了。所以必须先build好@tb,最后一次性查询
--构造@tb
select * from @tb
假如我已经通过@a,@b得到了一种@tb结果集,当我再次使用@c进行条件判断时,这样就会覆盖刚才的结果。
可以采用“删除不符合条件的记录”的方法来做,由于@tb已经得到了@a,@b想得到的结果,所以只要删除掉不符合@c的结果就行了。完。
复制代码 代码如下:

if @c is not null
begin
delete c from @tb c where c.id not in (select id from tb where f = @c)
end
select * from @tb

标签: 根据 条件 查询 临时 想得到 不同 结果 方法


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