yearweek
Description
Returns year and week number for a given date. This function works in the same way as the yearweek() function in MySQL.
This function is supported from v3.3 onwards.
Syntax
INT YEARWEEK(DATETIME|DATE date[, INT mode])
Parameters
date
: The supported data types are DATETIME and DATE.mode
: optional. The supported data type is INT. This parameter is used to specify the logic for calculating the yearweek number, that is, whether the week starts on Sunday or Monday, and whether the return value is in the range of 053 or 153. Value range: 0~7. Default value:0
. If this parameter is not specified, mode0
is used by default. The following table describes how this parameter works.
Mode | First day of week | Range | Week 1 is the first week … |
---|---|---|---|
0 | Sunday | 0-53 | with a Sunday in this year |
1 | Monday | 0-53 | with 4 or more days this year |
2 | Sunday | 1-53 | with a Sunday in this year |
3 | Monday | 1-53 | with 4 or more days this year |
4 | Sunday | 0-53 | with 4 or more days this year |
5 | Monday | 0-53 | with a Monday in this year |
6 | Sunday | 1-53 | with 4 or more days this year |
7 | Monday | 1-53 | with a Monday in this year |
Return value
Returns a value of the INT type. Value range: 0~53. The specific range is determined based on the mode
parameter. NULL
is returned if the value of date
is invalid or the input value is empty.
Examples
Returns year and week for a date. The value of the mode argument defaults to 0
mysql> SELECT YEARWEEK('2007-01-01', 0);
+---------------------------+
| yearweek('2007-01-01', 0) |
+---------------------------+
| 200653 |
+---------------------------+
mysql> SELECT YEARWEEK('2007-01-01', 1);
+---------------------------+
| yearweek('2007-01-01', 1) |
+---------------------------+
| 200701 |
+---------------------------+
mysql> SELECT YEARWEEK('2007-01-01', 2);
+---------------------------+
| yearweek('2007-01-01', 2) |
+---------------------------+
| 200653 |
+---------------------------+
1 row in set (0.01 sec)