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Data metric functions

EMPTY_STRING_PERCENT (system data metric function)¶

Returns the percentage of column values that are empty strings (''). Whitespace-only strings are not counted; use BLANK_PERCENT to measure both. 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.EMPTY_STRING_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.

Example¶

Measure the percentage of empty strings in the middle_name column:

SELECT SNOWFLAKE.CORE.EMPTY_STRING_PERCENT(
  SELECT
    middle_name
  FROM hr.tables.empl_info
);