如果 SQL 表达式具有带有 SUBSELECT 查询的 LENGTH 函数，则将其转换为 SQLite
我知道在 SQLite 中，我们使用 LENGTH 函数而不是 len。但是，当我想将 LENGTH 函数与子查询一起使用时，如下所示：
select length(select name from tblNames where name=1)
我收到错误。这是表达式的 Microsoft SQL 版本：
iif(len((select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)))>0,( select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)),Cstr(Dr.Fr)) as Fr,
我将上面的表达式转换为 SQLite，如下所示：
(case length((select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=CAST(Dr.Fr as TEXT))>0 ( select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)) else CAST(Dr.Fr as TEXT) end) as Fr,
我做错了什么？我不能仅将 SUBSELECT 查询与 LRNGTH 函数一起使用吗？关于如何解决这个问题有什么建议吗？
I know that in SQLite, we use the LENGTH function instead of len. But when I want to use the LENGTH function with a subquery like so:
select length(select name from tblNames where name=1)
I receive an error. Here is the Microsoft SQL version of the expression:
iif(len((select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)))>0,( select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)),Cstr(Dr.Fr)) as Fr,
I converted the above expression into SQLite as so:
(case length((select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=CAST(Dr.Fr as TEXT))>0 ( select BilgiAcik from DigerBilg where BilgTip=12 and BilgDgr=Cstr(Dr.Fr)) else CAST(Dr.Fr as TEXT) end) as Fr,
What I'm I doing wrong about? Can't I just use the SUBSELECT query with the LRNGTH function? Any suggestions on how to solve this problem?
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您将需要重组您的声明，使其更类似于以下内容。
如果您愿意，您可以通过为子选择添加别名来更轻松地管理它。
You will want to restructure your statement to be more similar to the following.
You can manage this a bit more easily by aliasing the subselects if you like.