Question

Here I have a problem that seems to be easy to solve but I can’t find the solution. I need to select all rows that have the tag X and Y in the table tags grouped by product.

Tags

+———+——+

| product | tag |

+———+——+

| 1 | x |

+–+–+

| 1 | y |

+–+–+

| 2 | y |

+–+–+

| 2 | z |

+–+–+

| 3 | x |

+–+–+

| 3 | y |

+–+–+

So, in this case the rows to be selected are for the product 1 and 3 becasuse both have the tag X and Y

Thanks to all for your help!

Answer 1

  SELECT product
    FROM tags
   WHERE tag IN ('x', 'y')
GROUP BY product
  HAVING COUNT(*) = 2