sql server 2008 management studio not checking the syntax of my query

Question

As always, there will be a reasonable explanation for my surprise, but till then....

I have this query

delete from Photo  where hs_id  in (select hs_         


        

Answer 1

It's a strong argument for keeping column names consistent between tables. As @Martin says, the SQL syntax allows column names to be resolved from the outer query, when there's no match in the inner query. This is a boon when writing correlated subqueries, but can trip you up sometimes (as here)