Question

I have a table with a boolean value and I want to find out if a group of id’s have both values.

This sql selects the group of products I want to test:

SELECT 
  cp.ItemID,
  cp.IsUnitsOfMeasure
from grouped_products gp
LEFT JOIN products p ON p.product_id = gp.product_id
LEFT JOIN c_products cp ON cp.ItemID = p.product_id
WHERE gp.group_id=123

I want to find out if cp.IsUnitsOfMeasure for the group contains both 1 and 0.

Answer 1

SELECT   gp.group_id,
         SUM(cp.IsUnitsOfMeasure=0) AND SUM(cp.IsUnitsOfMeasure=1) AS ContainsBoth,
FROM     grouped_products AS gp
  LEFT JOIN products      AS  p USING (product_id)
  LEFT JOIN c_products    AS cp ON cp.ItemID = p.product_id
GROUP BY gp.group_id

ContainsBoth will be TRUE or FALSE to indicate whether or not each respective group contains both a c_product with IsUnitsOfMeasure=0 and another with =1.