Categories:: Data metric functions

BLANK_PERCENT (system data metric function)¶

Returns the percentage of column values that are blank for the specified column in a table.

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 to automate data quality checks.

Syntax¶

SNOWFLAKE.CORE.BLANK_PERCENT(<query>)

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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 NUMBER value.

Example¶

Measure the percentage of blank fields for the SSN column (US social security number):

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

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+-------------------------------------------------------------------+
| SNOWFLAKE.CORE.BLANK_PERCENT(SELECT ssn FROM hr.tables.empl_info) |
+-------------------------------------------------------------------+
| 1                                                                 |
+-------------------------------------------------------------------+