Sorry, it was an error in previous letter.
3 липня 2009 р. 14:22 Віталій Тимчишин <tivv00@xxxxxxxxx> написав:
2009/7/1 Mike Ivanov <mikei@xxxxxxxxxxxxxxx>This is not enough. You have to add this condition as well:
> LEFT outer JOIN ville ON ville.uid = bien.ref_ville
> LEFT outer JOIN freguesia_ville ON freguesia_ville.ref_ville =ville.uid
AND bien.ref_ville = freguesia_ville.ref_ville
In other words, when you link three tables by a common field, all three relationships should be explicitly expressed, otherwise you'll have this type of explosive row multiplication.
Why so? Is not changing "freguesia_ville.ref_ville =ville.uid" to "freguesia_ville.ref_ville =bien.ref_ville" enough (to prevent cases when ville.uid is null as result of join)?
