CODEWITHSUNDEEP
mysql
Ciprian Lungu
Ciprian Lungu

Reputation: 300

MySQL select from multiple table with conditions

I have 4 tables:

mysql> select * from ARTICOLE;

| OID | ART      |  
|   1 | TEST     |
|   2 | TESTQ    |
|   3 | MYART    |
|   4 | MYARTBUC |

4 rows in set (0.00 sec)

mysql> select * from BAR;

| OID | ART   | CANT     |
|   1 | TEST  |  3.00000 |
|   2 | TESTQ |  1.00000 |
|   3 | MYART | 20.00000 |

3 rows in set (0.00 sec)

mysql> select * from BUCATARIE;

| OID | ART      | CANT     |
|   1 | TEST     |  5.00000 |
|   2 | MYARTBUC | 10.00000 |

2 rows in set (0.00 sec)

mysql> select * from MAGAZIE; Empty set (0.00 sec)

the below query

mysql> select a.ART,sum(bar.CANT),sum(buc.CANT),sum(mag.CANT) from ARTICOLE a,BUCATARIE buc,BAR bar,MAGAZIE mag where a.ART=bar.ART and a.ART=bar.ART and a.ART=mag.ART group by a.ART;

return:

Empty set (0.00 sec)

how must be query to return:

| ART | sum(bar.CANT) | sum(buc.CANT) | sum(mag.CANT) |
TEST  |  3.00000 | 5.00000 | NULL |
TESTQ |  1.00000 | NULL | NULL |
MYART | 20.00000 | NULL | NULL|
MYARTBUC | NULL | 10.00000 | NULL |

????

Any help appreciated.

Upvotes: 1

Views: 176

Answers (1)

mellamokb
mellamokb

Reputation: 56769

You need to make use of LEFT JOIN to include results from other tables without filtering out records that don't match:

   select a.ART,sum(bar.CANT),sum(buc.CANT),sum(mag.CANT)
     from ARTICOLE a
left join BUCATARIE buc on buc.ART = a.ART
left join BAR bar on bar.ART = a.ART
left join MAGAZIE mag on mag.ART = a.ART
group by a.ART;

Sample results:

ART         SUM(BAR.CANT)   SUM(BUC.CANT)   SUM(MAG.CANT)
MYART       20      
MYARTBUC                    10  
TEST        3               5   
TESTQ       1

Demo: http://www.sqlfiddle.com/#!2/6efb2/2

Upvotes: 1

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