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tostring

The tostring function converts the input to a value of type string.

Syntax

tostring( Expression )

Arguments

  • Expression: Expression to convert to a string.

Returns

If the Expression value is non-null, returns a string representation of Expression.

If the Expression value is null, returns null as well.

This is different from standard Kusto Query Language (KQL), in which tostring returns an empty string for null values.

Example

  • tostring(123) returns "123"
  • tostring("hello") returns "hello"
  • tostring(null) returns null