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Get the week number in MySQL for day of week?
MySQL DAYOFWEEK() function returns 1 for Sunday, 2 for Monday and so on for day of week. Let us see an example by first creating a table −
mysql> create table DayOfWeekDemo −> ( −> Issuedate datetime −> ); Query OK, 0 rows affected (0.52 sec)
Inserting date in the table with the help of insert command. The query is as follows −
mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 5 day)); Query OK, 1 row affected (0.52 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 6 day)); Query OK, 1 row affected (0.13 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 7 day)); Query OK, 1 row affected (0.10 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 8 day)); Query OK, 1 row affected (0.15 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 9 day)); Query OK, 1 row affected (0.10 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 10 day)); Query OK, 1 row affected (0.13 sec) mysql> insert into DayOfWeekDemo values(date_add(curdate(),interval 11 day)); Query OK, 1 row affected (0.10 sec)
Now you can display how many records are present in the table with the help of select statement. The query is as follows −
mysql> select *from DayOfWeekDemo;
The following is the output −
+---------------------+ | Issuedate | +---------------------+ | 2018-12-03 00:00:00 | | 2018-12-04 00:00:00 | | 2018-12-05 00:00:00 | | 2018-12-06 00:00:00 | | 2018-12-07 00:00:00 | | 2018-12-08 00:00:00 | | 2018-12-09 00:00:00 | +---------------------+ 7 rows in set (0.00 sec)
Look at the table above: 2018-12-03 is a Monday, 2018-12-04 is Tuesday, etc. The following is the query to return the index of day of week −
mysql> select dayofweek(Issuedate) as WeekNumber from DayOfWeekDemo;
The following is the output displaying day number of week −
+------------+ | WeekNumber | +------------+ | 2 | | 3 | | 4 | | 5 | | 6 | | 7 | | 1 | +------------+ 7 rows in set (0.00 sec)
Updated on: 25-Jun-2020
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