Question

TableA

Id  | M  | D  |   Y   |
=======================
1  | 10  | 28  | 2012 |
2  | 11  | 29  | 2012 |
3  | 12  | 30  | 2012 |

TableB

Id  | M  | D  |   Y   |
=======================
4  | 09  | 28  | 2012 |
5  | 11  | 29  | 2012 |
6  | 01  | 30  | 2013 |

I will search by M and D

Ex: If matching M = 11 AND D = 29 … so will return ID(s) 2 , 5

I can only find by one table like this

mysql_query("SELECT * FROM TableA WHERE M='11' AND Y='29' ORDER BY D ASC , Id DESC;";)

But how to find in multiple tables ?

Answer 1

You better use UNION ALL (in case tableB has identical records) to get all the records. Otherwise just UNION will do.

SELECT * FROM TableA WHERE M='11' AND Y='29'
UNION ALL
SELECT * FROM TableB WHERE M='11' AND Y='29'
ORDER BY D ASC , Id DESC;