混合两个sql查询：返回第一个查询的内容，但忽略第二个查询的内容

Question

I have two queries which work properly:

SELECT DISTINCT MarcadaProduccio.Article, 
                SUM(MarcadaProduccio.Rendiment * MarcadaProduccio.HoresMarcada)/SUM(MarcadaProduccio.HoresMarcada) AS MitjanaPonderada 
FROM MarcadaProduccio 
INNER JOIN MarcadaProduccio ON ParosMarcadesProduccio.IDMarcada = MarcadaProduccio.ID
WHERE   MarcadaProduccio.Article IN (SELECT DISTINCT MarcadaProduccio.Article FROM MarcadaProduccio) 
GROUP BY MarcadaProduccio.Article

SELECT ParosMarcadesProduccio.IDMarcada 
FROM ParosMarcadesProduccio 
WHERE ParosMarcadesProduccio.DescripcioParo LIKE "%MONTAJE%"

What I would like is to do one query which SELECTs as requested in the first query but ignoring the rows returned by the second query when ParosMarcadesProduccio.IDMarcada = MarcadaProduccio.ID.

How do I do that?

Thank you

PD: Structure of the tables MarcadaProduccio and ParosMarcadesProduccio

Answer 1

Your first query cannot work, because ParosMarcadaProduccio is not defined. You can simplify the query to something like this:

SELECT mp.Article, SUM(mp.Rendiment * mp.HoresMarcada) / SUM(mp.HoresMarcada) AS MitjanaPonderada 
FROM MarcadaProduccio mp INNER JOIN
     ParosMarcadaProduccio pmp
     ON pmp.IDMarcada = mp.ID
WHERE mp.Article IN (SELECT mp2.Article FROM MarcadaProduccio mp2) 
GROUP BY mp.Article;

Note that the SELECT DISTINCT s are not needed.

SELECT mp.Article, SUM(mp.Rendiment * mp.HoresMarcada) / SUM(mp.HoresMarcada) AS MitjanaPonderada 
FROM MarcadaProduccio mp INNER JOIN
     ParosMarcadaProduccio pmp
     ON pmp.IDMarcada = mp.ID
WHERE mp.Article IN (SELECT mp2.Article FROM MarcadaProduccio mp2) AND
      NOT EXISTS (SELECT pmp.IDMarcada
                  FROM ParosMarcadaProduccio pmp2
                  WHERE pmp2.DescripcioParo LIKE '%MONTAJE%' AND
                        pmp.IDMarcada = mp.id
                 )
GROUP BY mp.Article;

When learning to use subqueries for filtering, I strongly recommend NOT EXISTS over NOT IN . The latter behaves strangely when the subquery returns NULL values. You might as well learn the better way first.

Answer 2

Use the following approach using NOT IN , just make sure that the ParosMarcadesProduccio.IDMarcada is never NULL .

SELECT MarcadaProduccio.ID, MarcadaProduccio.Article, 
       SUM(MarcadaProduccio.Rendiment * MarcadaProduccio.HoresMarcada)/SUM(MarcadaProduccio.HoresMarcada) AS MitjanaPonderada 
FROM MarcadaProduccio 
INNER JOIN MarcadaProduccio ON ParosMarcadesProduccio.IDMarcada = MarcadaProduccio.ID
WHERE   MarcadaProduccio.Article IN (SELECT DISTINCT MarcadaProduccio.Article FROM MarcadaProduccio) and
        MarcadaProduccio.ID NOT IN (
           --your second query
           SELECT ParosMarcadesProduccio.IDMarcada 
           FROM ParosMarcadesProduccio 
           WHERE ParosMarcadesProduccio.DescripcioParo LIKE "%MONTAJE%"             
        )
GROUP BY MarcadaProduccio.ID, MarcadaProduccio.Article

EDIT: as noted by others, DISTINCT seems suspicious in your query and it should be probably removed.