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SQL conditional functions

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The InfluxDB SQL implementation supports the following conditional functions for conditionally handling null values:

coalesce

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])
Arguments
  • 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.

View coalesce query example

ifnull

Alias of nvl.

nullif

Returns null if expression1 equals expression2; otherwise it returns expression1. This can be used to perform the inverse operation of coalesce.

nullif(expression1, expression2)
Arguments
  • 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.

View nullif query example

nvl

Returns expression2 if expression1 is null; otherwise it returns expression1.

nvl(expression1, expression2)
Arguments
  • expression1: Return this expression if not null. Can be a constant, column, or function, and any combination of arithmetic operators.
  • expression2: Return this expression if expression1 is null. Can be a constant, column, or function, and any combination of arithmetic operators.

View nvl query example


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