Question

I have 2 tables in database: table_1 and table_2.

table_1 contains 3 column namely a_id, a_zone, a_address

table_2 contains 4 column namely p_id, not_use, p_zone, p_address

The row numbers are not same in the 2 tables. I need to compare the “DATA SET” of the (a_zone, a_address) from table_1 with (p_zone, p_address) from table_2.

Let me give you an example:

Table1 contains:

a_zone  a_address
=================
1       8
2       9
3       6
4       9
5       2

Table2 contains:

p_zone  p_address
=================
1       8
2       9
3       6
4       9
5       8

Now I need to compare like this a_zone, a_address = p_zone, p_address or not.

I do not need to compare only a_zone with only p_zone or only a_address with only p_address. Rather, I need to compare the whole data combination. for my above example, I need to compare 18 with 18 [a_zone,a_address WITH p_zone, p_address ]

I’m stuck with it, and really need help. Please suggest me….:)

Answer 1

You haven’t specified what data you wish to return so I have assumed a simple join.

Unless I am mis understandng your query I do not think that you need a union I think that you can do this with a single join:

SELECT *
 FROM table_1 JOIN table_2 
 WHERE (table_1.a_zone = table_2.p_zone) && (table_1.a_address = table_2.p_address);

This returns: