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sql count if

Posted on 2014-04-09
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I am needing to look at a table and see if columns have a match.  I want to see if multiple employees have been clocked onto the same work order and operation.  I have the columns odd_no, Oper_no and empid.  for example I may have the work order number 123456 with operation number 10.  I want to COUNT how many different employees worked on that operation..
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Question by:sharris_glascol
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LVL 66

Expert Comment

by:Jim Horn
ID: 39988988
SELECT COUNT(DISTINCT empid)
FROM your_table
WHERE odd_no = 123456 AND oper_no = 10

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You'll want to look at the full data set just to make sure the above is correct, and any duplicate values are being handled

SELECT odd_no, oper_no, emp_id
FROM your_table
WHERE odd_no = 123456 AND oper_no = 10
ORDER BY odd_no, oper_no, emp_id

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Author Comment

by:sharris_glascol
ID: 39988993
what if I want to look at all work orders and operations to see how many employees where clocked into the same one and not just one  exact work order?
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Expert Comment

by:Jim Horn
ID: 39989017
Not entirely sure what you mean by 'the same one', but give this a whirl..

List...

SELECT odd_no, oper_no, emp_id
FROM your_table
ORDER BY odd_no, oper_no, emp_id

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Count...

SELECT odd_no, oper_no, COUNT(emp_id) as empl_id_count
FROM your_table
GROUP BY odd_no, oper_no
ORDER BY odd_no, oper_no

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Author Comment

by:sharris_glascol
ID: 39989044
Here is what i need to count

work order     operation number     employee number     count
12345                  10                                2321                           2
2468                      20                               1234                          2
12345                     10                               1234                         2
2468                       20                                2321                        2
13579                    10                                 2321                        1

This is kinda what I am looking for....
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LVL 66

Expert Comment

by:Jim Horn
ID: 39989172
Nice mockup data.  Next time please add that to your original question, so we don't have to spend time flushing out requirements.

Based on the set above, give this a whirl, and add an ORDER BY clause to sort it by whatever is most readable..
SELECT 
   odd_no as work_order, 
   oper_no as operation_number, 
   emp_id as employee_number, 
   COUNT(emp_id) as empl_id_count
FROM your_table
GROUP BY odd_no, oper_no, emp_id

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Accepted Solution

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PortletPaul earned 2000 total points
ID: 39990666
Both sample data and expected results are best practice when asking this type of question. At this point I think we have the expected result but can deduce the sample data.

Jim is ever so close but I believe you need

COUNT() OVER()

to match that expected result. Like this:
    CREATE TABLE Your_Table
    	([odd_no] int, [Oper_no] int, [empid] int) 
    ;
    	
    INSERT INTO Your_Table
    	([odd_no], [Oper_no], [empid])
    VALUES
    	(12345, 10, 1234),
    	(12345, 10, 2321),
    	(13579, 10, 2321),
    	(2468, 20, 2321),
    	(2468, 20, 1234)
    ;

**Query 1**:

    SELECT
          odd_no                                           AS work_order
        , oper_no                                          AS operation_number
        , empid                                            AS employee_number
        , COUNT(empid) OVER (PARTITION BY odd_no, oper_no) AS empl_id_count
    FROM your_table
    ORDER BY
          odd_no,
          oper_no,
          empid
    

**[Results][2]**:
    
    | WORK_ORDER | OPERATION_NUMBER | EMPLOYEE_NUMBER | EMPL_ID_COUNT |
    |------------|------------------|-----------------|---------------|
    |       2468 |               20 |            1234 |             2 |
    |       2468 |               20 |            2321 |             2 |
    |      12345 |               10 |            1234 |             2 |
    |      12345 |               10 |            2321 |             2 |
    |      13579 |               10 |            2321 |             1 |

http://sqlfiddle.com/#!3/4002c/1

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