![]() ![]() The following statement returns the number of orders per week in 2013 using the WEEK function: SELECT WEEK(orderDate) week_no, See the following orders table in the sample database. The WEEK function returns a week number followed according to ISO 8601:1988 MySQL WEEK function example Otherwise, the week is numbered as the last week of the previous year and the next week is week 1.If the week that contains January 1st and has 4 or more days in the new year, the week is numbered as week 1.The ” with 4 or more days this year” in the above table means: The following table illustrates how the mode argument influcences the WEEK function: Mode In our server, the default value of default_week_format is 0. To get the current value of default_week_format variable, you use the SHOW VARIABLES statement as follows: mysql> SHOW VARIABLES LIKE 'default_week_format' If you ignore the mode argument, the WEEK function will use the value of the default_week_format system variable by default. It allows you to specify whether the week should start on Monday or Sunday and the returned week number should be between 0 and 52 or 0 and 53. mode is an optional argument that determines the logic of week number calculation.date is the date that you want to get a week number.To check whether a particular date belongs to which week number, you use the WEEK function as follows: WEEK(date, mode) Ĭode language: SQL (Structured Query Language) ( sql ) So for a year we often has 365 / 7 = 52 weeks that range from 1 to 52. A year is then divided into weeks with each week has exact 7 days. ![]() Typically, a year has 365 days for a normal year and 366 days for leap year. Summary: in this tutorial, you will learn how to use the MySQL WEEK function to get the week number for a date.
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