MariaDB: YEARWEEK Function
This MariaDB tutorial explains how to use the MariaDB YEARWEEK function with syntax and examples.
Description
The MariaDB YEARWEEK function returns the year and week for a date value.
Syntax
The syntax for the YEARWEEK function in MariaDB is:
YEARWEEK( date_value, [ mode ] )
Parameters or Arguments
- date_value
- A date or datetime value from which to extract the year and week.
- mode
Optional. It is used to specify what day the week starts on. It can be one of the following:
mode Explanation Week Value 0 First day of the week is Sunday 0-53 1 First day of the week is Monday and the first week has more than 3 days 0-53 2 First day of the week is Sunday 1-53 3 First day of the week is Monday and the first week has more than 3 days 1-53 4 First day of the week is Sunday and the first week has more than 3 days 0-53 5 First day of the week is Monday 0-53 6 First day of the week is Sunday and the first week has more than 3 days 1-53 7 First day of the week is Monday 1-53
Note
- The YEARWEEK function will return a year value as well as a week value (between 0-53 or 1-53) depending on the mode specified.
- The YEARWEEK function may return a year value that is different than the year displayed in the date_value because of the mode specified. This should only happen in the first week of the year and the last week of the year.
- If you are running MariaDB 4.0.14+ and the mode is not specified, the YEARWEEK function will use the value in the default_week_format system variable as the mode.
- If you are running a version of MariaDB that is older than 4.0.14 and the mode is not specified, the YEARWEEK function will use 0 as the mode.
- See also the EXTRACT, YEAR, QUARTER, MONTH, DAY, HOUR, MINUTE, SECOND, and MICROSECOND functions.
Applies To
The YEARWEEK function can be used in the following versions of MariaDB:
- MariaDB 10
Example
Let's look at some MariaDB YEARWEEK function examples and explore how to use the YEARWEEK function in MariaDB.
For example:
(Note: Your results may vary from the examples below depending on what your default_week_format system variable is set to.)
SELECT YEARWEEK('2014-01-01'); Result: 201352 SELECT YEARWEEK('2014-01-05'); Result: 201401 SELECT YEARWEEK('2014-01-12'); Result: 201402 SELECT YEARWEEK('2014-07-16'); Result: 201428 SELECT YEARWEEK('2014-12-31'); Result: 201452 SELECT YEARWEEK('2015-01-01'); Result: 201452
This last YEARWEEK example would display the year and week for the current system date (current system date is returned by the CURDATE function).
SELECT YEARWEEK(CURDATE());
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