Question

I have an sql table with structure

CREATE TABLE IF NOT EXISTS `engine4_user_fields_values` (
  `item_id` int(11) unsigned NOT NULL,
  `field_id` int(11) unsigned NOT NULL,
  `value` text COLLATE utf8_unicode_ci NOT NULL,
  PRIMARY KEY (`item_id`,`field_id`,`index`)
)

I want to select rows with field_id =’17’ AND value IN(5,8,7)+field_id =’20’ AND values IN(73,76)

I could not select it like given below, since if field_id is 17 it will not be 20!

SELECT * FROM `engine4_user_fields_values` WHERE (field_id ='17' AND value IN(5,8,7)) AND (field_id ='20' AND value IN(73,76))

If we use OR then it will select the value satisfying any of the condition.

Shall we use join for that? I am not sure about the code!
Any one please help me to get the select query for this

Answer 1

You could group by item, and use a having clause to require that the item has rows that match both conditions:

select  item_id
from    engine4_user_fields_values
group by
        item_id
having  max(case when field_id ='17' and value in (5,8,7) then 1 end) = 1
        and max(case when field_id ='20' and value in (73,76) then 1 end) = 1