As a follow up to In SQL / MySQL, what is the difference between "ON" and "WHERE" in a join statement? and SQL join: where clause vs. on clause - it does matter if a condition is placed in the on-clause vs. the where-clause in an outer join.
However, does it matter which on-clause the condition is placed in when there are multiple outer joins?
For example, could these produce different results?
select * from t1 left join t2 on t1.fid=t2.id and t2.col=val
left join t3 on t2.fid=t3.id;
vs:
select * from t1 left join t2 on t1.fid=t2.id
left join t3 on t2.fid=t3.id and t2.col=val;
Absolutely they are different.
The fisrt query will only have t2 rows that satisfy t2.col=val
The second query will include all t2 rows and only list t3 when t2.col=val