Question

I have a mysql query like this

SELECT id, dpost FROM uid1088_qposts
UNION
SELECT id, dpost FROM uid1091_qposts
WHERE DATE(dpost)='2012-01-01'

but the dpost column is a datetime column which stores a data like this

2012-01-12 11:55:43

the query shows no errors but produces a wrong output

is there anyway i can union two tables using a where clause in this kind of filtering?
the two tables does not unite… only the first queried table shows its data and filters a wrong date

Answer 1

In your case your code is interpreted like :

(SELECT id, dpost FROM uid1088_qposts)
UNION
(SELECT id, dpost FROM uid1091_qposts WHERE DATE(dpost)='2012-01-01')

if you want to filter all of your lines use

(SELECT id, dpost FROM uid1088_qposts WHERE DATE(dpost)='2012-01-01')
UNION
(SELECT id, dpost FROM uid1091_qposts WHERE DATE(dpost)='2012-01-01')