Question

I’m trying to implement a JOIN with two tables, but have stumbled upon a little problem.
I’ve got the following data structure:

Original table
ID – Name – Value
1 – John – Clerk
2 – Jack – Driver

Join table
ID – Name
1 – John
2 – Jack
3 – Matt

I need to join my tables so that the result will be the following:

Result
ID – Name – Value
1 – John – Clerk
2 – Jack – Driver
3 – Matt – null

So, I wrote the following statement SELECT * FROM original_table LEFT JOIN join_table ON original_table.ID GROUP BY join_table.ID

And it returns me the following result:

Result
ID – Name – Value
1 – John – Clerk
2 – Jack – Clerk
3 – Matt – Clerk

What should I fix in order to value column be ignored during the join?

Thank you.

Answer 1

• swap the table names
• remove the group by clause.

Try the following,

SELECT  a.id, a.name, b.value
FROM    join_table a 
        LEFT JOIN original b
            on a.id = b.id

SQLFiddle Demo