Categories:: Data metric functions

NOT_NULL_PERCENT (system data metric function)¶

Returns the percentage of column values that are not NULL for the specified column in a table. 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.NOT_NULL_PERCENT(<query>)

Arguments¶

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

Allowed data types¶

The column projected by the query must have one of the following data types:

DATE
FLOAT
NUMBER
TIMESTAMP_LTZ
TIMESTAMP_NTZ
TIMESTAMP_TZ
VARCHAR

Returns¶

The function returns a FLOAT value.

Example¶

Measure the percentage of non-NULL values for the SSN column:

SELECT SNOWFLAKE.CORE.NOT_NULL_PERCENT(
  SELECT
    ssn
  FROM hr.tables.empl_info
);