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Data metric functions

INVALID_PL_PESEL_PERCENT (system data metric function)

Returns the percentage of column values that are not a Polish PESEL number: eleven digits that encode a possible birth date. 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_PL_PESEL_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. The function returns NULL if the table or view has no rows.

Usage notes

  • The value must be eleven digits. The third and fourth digits are the birth month, offset by century: 01 to 12, 21 to 32, 41 to 52, 61 to 72, or 81 to 92. The fifth and sixth digits are the day, 01 to 31.
  • The whole value must match. A value with leading or trailing whitespace, or with separators other than the ones described here, is counted.
  • The day is not checked against the month, so a date such as February 31 is accepted.
  • The function checks the format only; it does not validate the check digit or verify that the number was issued.

Example

Measure the percentage of invalid Polish PESEL numbers in the pesel column:

SELECT SNOWFLAKE.CORE.INVALID_PL_PESEL_PERCENT(
  SELECT
    pesel
  FROM hr.tables.employees
);