WEEK(date[,mode]) returns the week number for date : WEEK « Date Time Functions « MySQL Tutorial

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MySQL Tutorial » Date Time Functions » WEEK 
14. 55. 1. WEEK(date[,mode]) returns the week number for date

The mode specifies whether the week starts on Sunday or Monday.

If the mode argument is omitted, the value of the default_week_format system variable is used.

The mode could be 0 ,1 ,2 ,3 ,4 ,5 ,6 ,7

mysql>
mysql> SELECT WEEK('1998-02-20');
+--------------------+
| WEEK('1998-02-20') |
+--------------------+
|                  |
+--------------------+
row in set (0.00 sec)

mysql> SELECT WEEK('1998-02-20',0);
+----------------------+
| WEEK('1998-02-20',0|
+----------------------+
|                    |
+----------------------+
row in set (0.00 sec)

mysql> SELECT WEEK('1998-02-20',1);
+----------------------+
| WEEK('1998-02-20',1|
+----------------------+
|                    |
+----------------------+
row in set (0.00 sec)

mysql> SELECT WEEK('1998-12-31',1);
+----------------------+
| WEEK('1998-12-31',1|
+----------------------+
|                   53 |
+----------------------+
row in set (0.02 sec)

mysql> SELECT WEEK('2000-01-01',2);
+----------------------+
| WEEK('2000-01-01',2|
+----------------------+
|                   52 |
+----------------------+
row in set (0.00 sec)

mysql>
14. 55. WEEK
14. 55. 1. WEEK(date[,mode]) returns the week number for date
14. 55. 2. WEEK(date), parameter, returns the week of the year in the range 0 to 53:
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