How to differentiate between same field names of two tables in a select query?

Question

I have more than two tables in my database and all of them contains same field names like

table A           table B       table C
field1            field1            


        

Answer 1

This is an artifact of how your programming tool handles duplicated field names. If you like, you can use AS to alias field names:

SELECT a.field1 AS a_field1, ...

It should then be accessible as a_field1.

Answer 2

Just write like this,

select a.field1 as af1,a.field2 as af2,a.field3 as af3,b.field1 as bf1,b.field2 as bf2,b.field3 as bf3,c.field1 as cf1,c.field2 as cf2,c.field3 as cf3 from table A as a, table B as b,table C as c where so and so.

Answer 3

You can alias the columns. e.g. Note: The syntax can vary depending on your DB.

SELECT
    a.field1 `A_Field1`,
    b.field1 `B_Field1`

SELECT
    a.field1 [A_Field1],
    b.field1 [B_Field1]

SELECT
    a.field1 AS A_Field1,
    b.field1 AS B_Field1