Question

SELECT TOP 1 * FROM 
(
    select max(updatedtimestamp) from db1.dbo.policyrepresentationcache with(nolock)
    UNION
    select max(updatedtimestamp) from db2.dbo.policyrepresentationcache with(nolock)
    ) 
ORDER BY updatedtimestamp

I’m running into syntax errors here and im not sure how to set it up.

Answer 1

You’re just missing an alias for the table produced by the union. I’ve aliased it as a below.

SELECT TOP 1 a.updatedtimestamp FROM
(
     select max(updatedtimestamp) as updatedtimestamp  
     from db1.dbo.policyrepresentationcache with(nolock)
     UNION
     select max(updatedtimestamp) 
     from db2.dbo.policyrepresentationcache with(nolock)
) a
ORDER BY a.updatedtimestamp