SQL Count(*) on multiple tables

Question

Hi all,

I am writing a horse racing web app and i have a stats page. What i am trying to do is show how many winners there are from each year.

Currently i have this:

SELECT `Horse Number`, Count(*) AS `Total Winners`
FROM `races`.`2009`
WHERE `Win $`>0 
GROUP BY `Horse Number`
ORDER BY Count(*) DESC;

It works like a charm and returns the following

Horse Number | Total Winners
1|48
2|49
3|39
4|31
5|26
6|31
7|21
8|25
9|31
10|16
11|16
12|20
13|9
14|8
15|6
16|3
17|3
18|2
19|2

I have now created a table for 2010 and i am wanting SQL to return something similar but i want it to search over 2009 and 2010 at the same time. I thought something like this might do the trick.

SELECT `Horse Number`, Count(*) AS `Total Winners`
FROM `races`.`2009`
WHERE `Win $`>0 
GROUP BY `Horse Number`
UNION
SELECT `Horse Number`, Count(*) AS `Total Winners`
FROM `races`.`2010`
WHERE `Win $`>0 
GROUP BY `Horse Number`
ORDER BY Count(*) DESC;

But it is just returning extra results at the bottom of the table so i now have 2 rows for each horse like this

Horse Number | Total Winners
1|48
2|49
3|39
4|31
5|26
6|31
7|21
8|25
9|31
10|16
11|16
12|20
13|9
14|8
15|6
16|3
17|3
18|2
19|2
1|0
2|0
3|0
4|0
5|0
6|0
7|0
8|0
9|0
10|0
11|0
12|0
13|0
14|0
15|0
16|0
17|0
18|0
19|0

Is anyone able to assist me please

Thanks

Answer 1

First off, I would suggest having ONE table with an extra column for a year.

Second, with the current table structure, you can do

SELECT `Horse Number`, Count(*) AS `Total Winners`
FROM (
  SELECT * FROM `races`.`2009`
  UNION ALL
  SELECT * FROM `races`.`2010`
) all_races
WHERE `Win $`>0 
GROUP BY `Horse Number`
ORDER BY Count(*) DESC;

Answer 2

In a single command how we can calculate total no. records from multiple tables (from two tables)

SELECT Count(*) AS FROM (SELECT * FROM abc UNION ALL SELECT * FROM xyz);

In a single command how we can calculate total no. records from multiple tables (from three tables)

SELECT Count(*) AS FROM (select * from abc union all select * from xyz union all SELECT * from pqr);