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Count distinct values on sevaral fields

Count distinct values on sevaral fields

Count distinct values on sevaral fields

(OP)
Hi, I have a sort of stupid table structure on the project I inherited. It's a list of what work was performed that uses codes like this:

CustomerID | Date | Code1 | Code2 | Code3 | Code4

I want to know all work that was performed for a certain period and thus need to count the distinct codes on codes 1-4.

Say I have the test data:

1 | today | AA | AB | AC | Null
2 | today | AC | BB | Null | Null

I want to get the following:

AA | 1
AB | 1
AC | 2
BB | 1

The table is pretty huge so I need an effective query... Any hints?

elephant2
graabein

RE: Count distinct values on sevaral fields

CODE

SELECT daCode
     , COUNT(*) AS daCount
  FROM ( SELECT Code1 AS daCode
           FROM daTable
          WHERE Code1 IS NOT NULL
         UNION ALL
         SELECT Code2
           FROM daTable
          WHERE Code2 IS NOT NULL
         UNION ALL
         SELECT Code3
           FROM daTable
          WHERE Code3 IS NOT NULL
         UNION ALL
         SELECT Code4
           FROM daTable
          WHERE Code4 IS NOT NULL
       ) AS d
GROUP
    BY daCode
smile

r937.com | rudy.ca
Buy my new book Simply SQL from Amazon

RE: Count distinct values on sevaral fields

(OP)
I think I did it! Check this out:

CODE

select Work.Code, count(*) from (
select Code1 as Code from table1
union all
select Code2 as Code from table1
) as Work
where Work.Code is not null
group by Work.Code

What do you think?

elephant2
graabein

RE: Count distinct values on sevaral fields

(OP)
LOL nice coincidence! Thanks man.

elephant2
graabein

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