Which SQL query is faster? Filter on Join criteria or Where clause?

Question

Compare these 2 queries. Is it faster to put the filter on the join criteria or in the WHERE clause. I have always felt that it is faster on the join criteria b

Answer 1

As far as the two methods go.

• JOIN/ON is for joining tables
• WHERE is for filtering results

Whilst you can use them differently it always seems like a smell to me.

Deal with performance when it is a problem. Then you can look into such "optimisations".