-- What it does: Shows why NULL cannot be compared using = or != -- Why use it: Prevents common beginner mistake ...
IS NULL ve IS NOT NULL, Boolean operatorleridir. Bİr ifadenin NULL olup olmadığını kontrol eder COALESCE (Birleştirme) ise bir fonksiyondur ve içerisindeki parametrelerden NULL olmayan ilk ifadeyi ...
IS NULL and IS MISSING are predicates that test for a missing value. IS NULL and IS MISSING are used in the WHERE, ON, and HAVING expressions. Each predicate resolves to true if the sql-expression's ...
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