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更新しました 2024/12/06
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nullif
Applies to: Databricks SQL Databricks Runtime
Returns NULL if expr1 equals expr2, or expr1 otherwise.
NULL
expr1
expr2
nullif(expr1, expr2)
expr1: An expression of any type.
expr2: An expression of the same type as expr.
expr
NULL if expr1 equals to expr2, or expr1 otherwise.
> SELECT nullif(2, 2); NULL > SELECT nullif(2, 3); 2
coalesce function
decode (key) function
case expression