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[sql] Joining 2 SQL SELECT result sets into one

I've got 2 select statements, returning data like this:

Select 1
col_a   col_b

Select 2
col_a   col_c

If I do union, I get something like

col_a col_b

And rows joined. What i need is getting it like this:

col_a  col_b  col_c

Joined on data in col_a

This question is related to sql join select

The answer is

Use JOIN to join the subqueries and use ON to say where the rows from each subquery must match:

SELECT T1.col_a, T1.col_b, T2.col_c
FROM (SELECT col_a, col_b, ...etc...) AS T1
JOIN (SELECT col_a, col_c, ...etc...) AS T2
ON T1.col_a = T2.col_a

If there are some values of col_a that are in T1 but not in T2, you can use a LEFT OUTER JOIN instead.

Use a FULL OUTER JOIN:

select 
   a.col_a,
   a.col_b,
   b.col_c
from
   (select col_a,col_bfrom tab1) a
join 
   (select col_a,col_cfrom tab2) b 
on a.col_a= b.col_a

SELECT table1.col_a, table1.col_b, table2.col_c 
  FROM table1 
  INNER JOIN table2 ON table1.col_a = table2.col_a

Source: Stackoverflow.com

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