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↑ 2023-04-17  MySQL: wie eine leere (NULL) Spalte überprüfen? 

Problem:
Wie kann man in MySQL überprüfen, ob eine Spalte leer (NULL) ist?

 
Lösung:
Beispiel: Setzt überall 0 ein, falls die Spalte leer ist (NULL enthält):
UPDATE Tabellenname SET Spalte=0 WHERE (Spalte IS NULL)
Beispiel: Sucht alle Einträge, die nicht NULL sind:
SELECT * FROM Tabellenname WHERE (Spalte IS NOT NULL)

 
Weitere Infos:
qastack.com.de - leer oder null
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