Question

I would like to select multiple values from a single column in a database table that equal to a number of values. I want all these values to match otherwise it should return no rows. I do not want to use “IN” as that is equal to “OR”.

The following is a basic mockup of what it should do but it needs to be dynamic as I wish to use it with a PDO statement. If the database only contains id’s 1 and 2 it should fail ie return no rows.

SELECT
id
FROM
reports
WHERE
id=1 AND id=2 AND id=3

I have the current code as follow which is incorrectly returning zero rows:

SELECT id,title
FROM reports
WHERE id IN (1,2)
GROUP BY title 
HAVING COUNT(DISTINCT id) = 2

My current table structure is as follows:
http://www.sqlfiddle.com/#!2/ce4aa/1

Answer 1

You have to use HAVING COUNT(id) = 3 to ensure that the selected rows have all the three id’s. Something like:

SELECT *
FROM reports
WHERE id = 1 OR id = 2 OR id = 3 -- Or id IN(1, 2, 3)
GROUP BY SomeOtherField
HAVING COUNT(DISTINCT id) = 3;

Or:

SELECT *
FROM reports
WHERE SomeOtherField IN (SELECT SomeOtherField 
                         FROM reports
                         WHERE id = 1 or id = 2 -- Or id IN(1, 2, 3)
                         GROUP BY SomeOtherField
                         HAVING COUNT(DISTINCT id) = 3
                        );

Note that: You have to GROUP BY SomeOtherField where SomeOtherField is other field than id because if you GROUP BY id with HAVING COUNT(id) you won’t get any records, since COUNT(id) will be always = 1.

Edit: fixed WHERE clause, OR‘s instead of AND‘s.

SQL Fiddle Demo