Question

Hey guys i have this query:

SELECT Schwellwert
FROM lm_Schwellwert
WHERE (Typ = (SELECT Typ FROM lm_Artikel WHERE `Index` = (SELECT DISTINCT `Index` FROM lm_Warenkorb)))

But when I run it I’m getting this error:

1242 – Subquery returns more than 1 row

I don’t know what is in my query wrong.

Example how lm_Schwellwert looks:

Typ     Schwellwert
Computer    78

Example how lm_Artikel looks:

Index   Artikelbezeichnung  Status  Bestand     Lieferant    Typ
1           HP Elitebook        OK      19         HP         Computer     

Example how lm_Warenkorb looks:

Index
11
1

Answer 1

Where condition could run only aginst one vale (so x=y and so on)
In your case, your subquery

(SELECT Typ FROM lm_Artikel WHEREIndex= (SELECT DISTINCTIndexFROM lm_Warenkorb))

is returning more than one row and this cause an error.

Try to modify your query as follow

SELECT Schwellwert
FROM lm_Schwellwert
WHERE (Typ IN (SELECT Typ FROM lm_Artikel WHERE `Index` IN (SELECT DISTINCT `Index` FROM lm_Warenkorb)))

The IN operator will help you, since accept a set of values and return true if Typ is equal to one of those