Example: Returning a Date Value for the Beginning of the Month - Analytics Database - Teradata Vantage

The following queries:

SELECT TRUNC(CAST('2003/09/15' AS DATE), 'MONTH') (FORMAT 'yyyy-mm-dd');

SELECT TRUNC(CAST('2003/09/30' AS DATE), 'MON') (FORMAT 'yyyy-mm-dd');

SELECT TRUNC(CAST('2003/09/17' AS DATE), 'MM') (FORMAT 'yyyy-mm-dd');

SELECT TRUNC(CAST('2003/09/17' AS DATE), 'RM') (FORMAT 'yyyy-mm-dd'); 

all return the result 2003-09-01. The date was truncated to the beginning of the month.