July 11, 2013 at 3:40 pm
I got the following example of some code to use an OUTER APPLY to get some data I need. I was able to get it to work in my environment, but there's one piece of the syntax I don't understand.
select Table1Key, MAX(LastModifiedDate)
from Table1
outer apply (
select Table1.LastModifiedDate
union all
select LastModifiedDate
from RTable01
where RTable01.Table1Key = Table1.Table1Key
union all
select LastModifiedDate
from RTable02
where RTable02.Table1Key = Table1.Table1Key
union all
select LastModifiedDate
from RTable30
where RTable30.Table1Key = Table1.Table1Key
)
---------------------------------------------------------
AllTables(LastModifiedDate)
----------------------------------------------------------
group by Table1.Table1Key
What is the AllTables() statement at then end of the OUTER APPLY() doing? I can't find any syntax references to it, and the whole thing doesn't work without it, so I feel like I should find out what it's doing!
July 11, 2013 at 3:45 pm
rray 44280 (7/11/2013)
I got the following example of some code to use an OUTER APPLY to get some data I need. I was able to get it to work in my environment, but there's one piece of the syntax I don't understand.
select Table1Key, MAX(LastModifiedDate)from Table1
outer apply (
select Table1.LastModifiedDate
union all
select LastModifiedDate
from RTable01
where RTable01.Table1Key = Table1.Table1Key
union all
select LastModifiedDate
from RTable02
where RTable02.Table1Key = Table1.Table1Key
union all
select LastModifiedDate
from RTable30
where RTable30.Table1Key = Table1.Table1Key
)
---------------------------------------------------------
AllTables(LastModifiedDate)
----------------------------------------------------------
group by Table1.Table1Key
What is the AllTables() statement at then end of the OUTER APPLY() doing? I can't find any syntax references to it, and the whole thing doesn't work without it, so I feel like I should find out what it's doing!
That is giving the subquery an alias of AllTables and assigning the 1 column the name of LastModifiedDate.
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