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Archivio tag: null

MariaDB/MySQL IS NULL conditions and indexes

Pubblicato il 14 Novembre 2020 da Federico Razzoli — 2 commenti ↓

It is quite common to use an equality condition and an IS NULL condition on the same columns. Unfortunately, this could make queries very slow. Continua a leggere MariaDB/MySQL IS NULL conditions and indexes→

Pubblicato inMariaDB, MySQL | Taggatonull | 2 Risposte

When to use NULLable columns in relational databases

Pubblicato il 15 Ottobre 2020 da Federico Razzoli — Nessun commento ↓

SQL columns can be NULL or NOT NULL. Let’s see what are the good and bad reasons to declare NULL columns. Continua a leggere When to use NULLable columns in relational databases→

Pubblicato inSQL Language | Taggatonull | Lascia un commento

What does NULL mean in SQL?

Pubblicato il 8 Agosto 2020 da Federico Razzoli — Nessun commento ↓
Escher cube

Does NULL mean “no value”? Or does it mean “an unknown value”? Its semantics and history are ambiguous and inconsistent. Continua a leggere What does NULL mean in SQL?→

Pubblicato inSQL Language | Taggatonull | Lascia un commento

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