Question

I have table prod with structure
Id, name, keyword, yearborn.

It is necessary to bring the number of keywords grouped encountered in the field yearborn , for example

SELECT yearborn, COUNT(Id) cnt1 FROM prod WHERE keyword='admiral'
GROUP BY yearborn

and

SELECT yearborn, COUNT(Id) cnt2 FROM prod WHERE keyword='captain' GROUP BY yearborn

How do I combine these two queries to get the output result table with the structure

yearborn, cnt1, cnt2?

I have tried UNION

SELECT yearborn, COUNT(Id) cnt1 FROM prod WHERE keyword='admiral' GROUP BY yearborn
UNION
SELECT yearborn, COUNT(Id) cnt2 FROM prod WHERE keyword='captain' GROUP BY yearborn

But result is:
yearborn, cnt1

Tell me please how to get out of this situation.

Answer 1

  SELECT yearborn, 
         SUM(IF(keyword = 'admiral', 1, 0)) cnt1, 
         SUM(IF(keyword = 'captain', 1, 0)) cnt2 
    FROM prod 
   WHERE keyword = 'admiral'
      OR keyword = 'captain'
GROUP BY yearborn

The result will be something like this (of course this is fictitious data):

+----------+------+------+
| yearborn | cnt1 | cnt2 |
+----------+------+------+
|     2004 | 1233 |    0 |
|     1999 |    0 |   15 |
+----------+------+------+