Question

I have a problem with my SQL query.

Situation is as follows:

I have two tables, A and B.

Table A:

---------------------------------------------
*| A.id  |  A.t_id  |  A.f_id  |  A.type    |*
---------------------------------------------
 |   1   |    32    |     3    |   Loading  |
 |   2   |    34    |     5    |  Discharge |
 |   3   |    32    |     3    |  Discharge |
---------------------------------------------

Table B:

-----------------------
*| B.id  | B.shipid |*
-----------------------
 |   1   |    1     |
 |   2   |    1     |
 |   3   |    2     |
-----------------------

I need all the rows from A where A.type=Loading, A.t_id is B.id -> B.shipid=2 and . My query so far is:

SELECT *  FROM A, B WHERE  (A.type='Loading' AND B.shipid=2 AND A.t_id=B.id)

but this doesn’t return the right records (none, actually) while the data should fit the query. Where does my query goes wrong?

Answer 1

Try this::

SELECT 
*  
FROM 
A
INNER JOIN B ON A.t_id=B.id

WHERE  A.type='Loading' AND B.shipid=2