Question

I am working on an SQL statement and just wanted to clarify my understanding of join syntax in MS SQL.

Say I have the SQL…

select t.year from HOUSE AS h 
LEFT OUTER JOIN SUBJECT K 
    ON H.Name = K.Name 
INNER JOIN TESTCASE AS T 
    ON k.year IS NOT NULL

Sorry for the confusing example but basically – why am I able to use LEFT OUTER JOIN SUBJECT K without the keyword AS whereas with an INNER JOIN, I need to use a keyword of AS for INNER JOIN TESTCASE AS T?

Answer 1

‘AS’ is not required in either of these cases, but I prefer it personally from the point of view of readability, as it conveys exactly what you were meaning to do.