Is there a logical difference between putting a condition in the ON clause of an inner join versus the where clause of the main query?

Question

Consider these two similar SQLs

(condition in ON clause)

select t1.field1, t2.field1
from
table1 t1 inner join table2 t2 on t1.id = t2.id and t1.bool         


        

Answer 1

In your specific case, the t1.boolfield specifies an additional selection condition, not a condition for matching records between the two tables, so the second example is more correct.

If you're speaking about the cases when a condition for matching records is put in the ON clause vs. in the WHERE clause, see this question.