SQL查询-选择的并集计数

Question

sorry to disturb you but I got a problem with a count of union; I try to implement the same logic that I read in other post but it's not working for me, some help please?

This is my code: / Declaration of data ?

/*where i should make the count*/

/*first select*/

UNION

/*second select*/
/*in the where of the second select I have a case with the following data*/
 CASE
    WHEN ((@case='other') AND (cfv.value like '%,' + cast (@today as VARCHAR) or cfv.value like '%' + cast    (@today as VARCHAR) 
    or cfv.value like '%' + cast (@today as VARCHAR)+',0'
    or cfv.value like '%' + cast (@today as VARCHAR)+',0,1'
    or cfv.value like '%' + cast (@today as VARCHAR)+',1'))
    then 1
    WHEN ((@case ='zero') AND(cfv.value='0')) THEN 1
    WHEN ((@case ='one') AND(cfv.value='1' or cfv.value='0,1')) THEN 1
    ELSE 0
END = 1

and this re result without count so I suppose that should be very easy but I don't get it :S Just a column of elements but I'd like to have the number of the element present in this case 2

Thanks so much in advance

Answer 1

If you're trying to get a count of all the records selected, you could do this:

SELECT COUNT(*) FROM
(
    SELECT First...
    UNION
    SELECT Second...
) AS CountTable

Just wrap your whole query in another SELECT statement and count from there.

Answer 2

Having a case statement in your where should not mess up the syntax. It is probably something else.

Make sure when doing a subquery you give it an alias.

SELECT COUNT(*)
FROM (
    /*first select*/
    UNION
    /*second select*/
    WHERE
    CASE
      WHEN ((@case='other') 
            AND (cfv.value LIKE '%,' + CAST(@today AS VARCHAR)
                 OR cfv.value LIKE '%' + CAST(@today AS VARCHAR) 
                 OR cfv.value LIKE '%' + CAST(@today AS VARCHAR)+',0'
                 OR cfv.value LIKE '%' + CAST(@today AS VARCHAR)+',0,1'
                 OR cfv.value LIKE '%' + CAST(@today AS VARCHAR)+',1'))
      THEN 1
      WHEN ((@case ='zero') AND (cfv.value='0')) THEN 1
      WHEN ((@case ='one') AND  (cfv.value='1' OR cfv.value='0,1')) THEN 1
      ELSE 0
    END = 1
) AS alias --<<--

Answer 3

You can try wrapping it in a select.

SELECT t.CompanyID, COUNT(*)
FROM (YOUR UNION QUERY) t
GROUP BY t.CompanyID