Categories:: Data metric functions

SPECIAL_CHARACTER_PERCENT (system data metric function)¶

Returns the percentage of non-NULL column values that contain characters outside the alphanumeric range (not A-Z, a-z, or 0-9). The percentage is computed over the total row count, including NULL values in the denominator. Spaces, punctuation, and Unicode characters are all counted as special.

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.SPECIAL_CHARACTER_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 values in the product_code column containing special characters:

SELECT SNOWFLAKE.CORE.SPECIAL_CHARACTER_PERCENT(
  SELECT
    product_code
  FROM inventory.tables.products
);