Sql server 检查列表是否为空或null，然后检查SQL

我有一个这样的疑问

with t as (
      <your query here>
     )
select t.id, t.name, t.randomid, trand.name as randomname
from t left join
     t trand
     on t.randomid = trand.id
where t.id in (select item from dbo.ufnSplit(@ids,','));

试试这个Where子句

试试这个Where子句

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您可以使用条件WHERE子句，如下所示：

with t as (
      <your query here>
     )
select t.id, t.name, t.randomid, trand.name as randomname
from t left join
     t trand
     on t.randomid = trand.id
where @ids IS NULL OR t.id IN (select item from dbo.ufnSplit(@ids,','));

因此，如果为NULL，它将返回所有内容，否则它将计算WHERE子句的或部分内容

---

您可能需要编辑函数：dbo.ufnSplit以优雅地处理空输入，这样才能工作。

您可以使用条件WHERE子句，如下所示：

with t as (
      <your query here>
     )
select t.id, t.name, t.randomid, trand.name as randomname
from t left join
     t trand
     on t.randomid = trand.id
where @ids IS NULL OR t.id IN (select item from dbo.ufnSplit(@ids,','));

因此，如果为NULL，它将返回所有内容，否则它将计算WHERE子句的或部分内容

---

您可能需要编辑函数：dbo.ufnSplit以优雅地处理NULL输入，这样才能工作。

这将检查@ids是NULL还是空，然后检查where子句

with t as (
      <your query here>
     )
select t.id, t.name, t.randomid, trand.name as randomname
from t left join
     t trand
     on t.randomid = trand.id
where @ids = '' 
   or @ids is null
   or t.id in (select item from dbo.ufnSplit(@ids,','))

---

这将检查@ids是否为null或空，然后检查where子句

with t as (
      <your query here>
     )
select t.id, t.name, t.randomid, trand.name as randomname
from t left join
     t trand
     on t.randomid = trand.id
where @ids = '' 
   or @ids is null
   or t.id in (select item from dbo.ufnSplit(@ids,','))