Final answer:
The statement is false. DAY is not used to indicate the numeric day of the year in the TO_DATE function's format argument; instead, functions like TO_CHAR with the 'DDD' format mask are used to extract the numeric day of the year from a date in SQL.
Step-by-step explanation:
The assertion that to indicate the numeric value of the day of the year for a date, you should include DAY in the format argument of the TO_DATE function is FALSE. In fact, the TO_DATE function is used to convert a string to a date format in SQL, and the format argument indicates the format of the input string, not the day of the year. To extract the day of the year from a date, one would typically use a function like TO_CHAR with the 'DDD' format mask in Oracle SQL, for example, or another similar function depending on the database system being used. Therefore, DAY is not related to the numeric day of the year but is actually used to represent the name of the day in date-time functions.