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Query to obtain count from one table based on another table

Posted on 2014-07-20
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Last Modified: 2014-07-25
Table 1:

EmpID  PositionID  CompanyID
12          1                123
13          1                 123
14          2                  123
15          3                  123

table 2

PositionID     test1eligibility     test2eligibility      test3eligibility
1                      1                           1                           0
2                       1                           0                          0
3                       0                             0                         1

I want to know how many empID's in table1 are eligible for test1 (that is test1eligibility =1), how many are eligible for test2 and how many are eligible for test3.
so the result i want is:

companyID     test1eligibility     test2eligibility      test3eligibility
123                      3                       2                              1

can you please help with the SQL query?
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Question by:Angel02
2 Comments
 
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Accepted Solution

by:
PortletPaul earned 2000 total points
ID: 40208267
SELECT
      t1.CompanyID
    , SUM(t2.test1eligibility) AS test1eligibility
    , SUM(t2.test2eligibility) AS test2eligibility
    , SUM(t2.test3eligibility) AS test3eligibility
FROM table1 t1
      INNER JOIN table2 t2
                  ON t1.PositionID = t2.PositionID
GROUP BY
      t1.CompanyID

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{+ edit} nb: because you display zeros and not nulls in table2 don't use count(), better to use sum() in this situation
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Author Comment

by:Angel02
ID: 40220504
Brilliant idea!
I just had to change boolean to integer for SUM. Thank you.
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