IS_STRING (Azure Cosmos DB)
APPLIES TO:
SQL API
Returns a Boolean value indicating if the type of the specified expression is a string.
Syntax
IS_STRING(<expr>)
Arguments
expr
Is any expression.
Return types
Returns a Boolean expression.
Examples
The following example checks objects of JSON Boolean, number, string, null, object, array, and undefined types using the IS_STRING function.
SELECT
IS_STRING(true) AS isStr1,
IS_STRING(1) AS isStr2,
IS_STRING("value") AS isStr3,
IS_STRING(null) AS isStr4,
IS_STRING({prop: "value"}) AS isStr5,
IS_STRING([1, 2, 3]) AS isStr6,
IS_STRING({prop: "value"}.prop2) AS isStr7
Here is the result set.
[{"isStr1":false,"isStr2":false,"isStr3":true,"isStr4":false,"isStr5":false,"isStr6":false,"isStr7":false}]
Remarks
This system function will benefit from a range index.