INNER JOIN vs LEFT JOIN performance in SQL Server
- by Ekkapop
I've created SQL command that use INNER JOIN for 9 tables, anyway this command take a very long time (more than five minutes). So my folk suggest me to change INNER JOIN to LEFT JOIN because the performance of LEFT JOIN is better, at first time its despite what I know. After I changed, the speed of query is significantly improve.
I want to know why LEFT JOIN is faster than INNER JOIN?
My SQL command look like below:
SELECT * FROM A INNER JOIN B ON ... INNER JOIN C ON ... INNER JOIN D and so no
