Categories:: Data metric functions

INVALID_UUID_PERCENT (system data metric function)¶

Returns the percentage of column values that are not a UUID in the hyphenated 8-4-4-4-12 hexadecimal form. The percentage is computed over the total row count, including NULL values in the denominator.

This topic provides the syntax for calling the function directly. To learn how to associate the function with a table or view so it runs at regular intervals, see Associate a DMF.

Syntax¶

SNOWFLAKE.CORE.INVALID_UUID_PERCENT(<query>)

Arguments¶

query: Specifies a SQL query that projects a single column.

Allowed data types¶

The column projected by the query must have the VARCHAR data type.

Returns¶

The function returns a FLOAT value.

Usage notes¶

The function checks the format only; it does not validate the UUID version or variant bits.

Example¶

Measure the percentage of invalid UUIDs in the request_id column:

SELECT SNOWFLAKE.CORE.INVALID_UUID_PERCENT(
  SELECT
    request_id
  FROM events.tables.requests
);