SQL conditional functions
The InfluxDB SQL implementation supports the following conditional functions for conditionally handling null values:
Returns the first of its arguments that is not null. Returns null if all arguments are null. This function is often used to substitute a default value for null values.
coalesce(expression1[, ..., expression_n])
- expression1, expression_n: Expression to use if previous expressions are null. Can be a constant, column, or function, and any combination of arithmetic operators. Pass as many expression arguments as necessary.
Returns null if expression1 equals expression2; otherwise it returns expression1.
This can be used to perform the inverse operation of
- expression1: Expression to compare and return if equal to expression2. Can be a constant, column, or function, and any combination of arithmetic operators.
- expression2: Expression to compare to expression1. Can be a constant, column, or function, and any combination of arithmetic operators.
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