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The WEEK Function Syntax for the WEEK function: date-or-timestamp is a date or timestamp value expression. Rules: The result is an integer value, 1 through 53, representing the week number in the year, calculated in accordance with the ISO 8601 standard. If the value of date-or-timestamp is NULL, then the result of the function is NULL.
Syntax for the WEEK function:
date-or-timestamp is a date or timestamp value expression.