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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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UFC - Urban Fäh Consulting
Kompetenz in Strategie, General Management und Nachfolge. Situation klären, Marktposition stärken, Nachfolge regeln.
Patrick Faeh Services   Ndihma për PC - Përkthimi - Programi - Rrjeti
Patrick Faeh Services   Agenda, Mungesa, Pa pranishëm, Plan, Pushime, Skedul
Klappmesser - Folding knife - Couteau pliant - Coltello pieghevole
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Apostroph Group - www.apostrophgroup.ch
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Outdoor Spirit - My To Go - We Love Camping - www.outdoor-spirit.ch
Products for all outdoor activities, daily out-of-home consumption, and camping.
Patrick Faeh Services   Agenda, Mungesa, Pa pranishëm, Plan, Pushime, Skedul
Rain jacket, Down jacket, Down gilet
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