Question

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SQL : Count the number of occurences occuring on output column and calculate some percentage based on the occurences

Here is url for test data / table : http://sqlfiddle.com/#!2/56ffd4/1

My table generates o/p for following table :

(id,       resolution) 
('abc-123', 'fail'),
('abc-456', 'pass'),
('abc-789', 'pass'),
('abc-799', 'fail'),
('abc-800', 'pass'),
('abc-900', 'pass');

my script o/p is :

id          RESOLUTION  TS              @PREV   C   RES
abc-123     fail    July, 02 2012         1     1   -
abc-456     pass    July, 02 2012         2     0   50.00%
abc-789     pass    July, 02 2012         1     0   100.00%
abc-799     fail    July, 02 2012         1     1   -
abc-800     pass    July, 02 2012         2     0   50.00%
abc-900     pass    July, 02 2012         0     0   100.00%

here is o/p script:

SELECT st.*, 
       @prev:=@counter + 1,
       @counter:= CASE 
         WHEN st.resolution = 'pass'
         THEN 0
         ELSE @counter + 1
       END c,
       CASE WHEN @counter = 0 
            THEN CONCAT(FORMAT(100/@prev, 2), '%') 
            ELSE '-' 
       END res
  FROM so_test st, (SELECT @counter:=0) sc

I need to append two columns to above output table to count occurrences for passing and fail values as:

id          RESOLUTION  TS              @PREV   C            fail   pass
    abc-123     fail    July, 02 2012         1     1   -        1
    abc-456     pass    July, 02 2012         2     0   50.00%          1
    abc-789     pass    July, 02 2012         1     0   100.00%         1
    abc-799     fail    July, 02 2012         1     1   -        1
    abc-800     pass    July, 02 2012         2     0   50.00%          1
    abc-900     pass    July, 02 2012         0     0   100.00%         1

Answer 1

Well if you just want the pass and fail columns at the end of the output table as you’ve specified then put a comma after

END res 

and add the following after it:

CASE WHEN st.resolution = 'fail'
            THEN 1
            ELSE NULL
END fail,
CASE WHEN st.resolution = 'pass'
            THEN 1
            ELSE NULL
END pass

Not sure what the blank is in your columns but I’ve just set them as NULL.