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# MySQL | WEEKOFYEAR method

schedule Aug 10, 2023
Last updated
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MySQL
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MySQL's `WEEKOFYEAR(~)` method returns the week number (1 - 53) from a given date or datetime.

NOTE

This method assumes Monday is the first day of the week & the first week of the year has more than 3 days.

# Parameters

1. `date` | `date/datetime`

The date/datetime to retrieve the week number from.

# Return value

A week number in the range 1 - 53.

# Examples

Consider the following table about some students:

student_id

fname

lname

day_enrolled

age

1

Sky

Towner

2015-12-03

17

stowner1

2

Ben

Davis

2016-04-20

19

bdavis2

3

Travis

Apple

2018-08-14

18

tapple3

4

Arthur

David

2016-04-01

16

5

Benjamin

Town

2014-01-01

17

btown5

The above sample table can be created using the code here.

## Basic usage

To return the week number from the date that current students enrolled:

``` SELECT fname, WEEKOFYEAR(day_enrolled)FROM students; +----------+--------------------------+| fname | WEEKOFYEAR(day_enrolled) |+----------+--------------------------+| Sky | 49 || Ben | 16 || Travis | 33 || Arthur | 13 || Benjamin | 1 |+----------+--------------------------+ ```

To return students who were enrolled before week `26`:

``` SELECT fname, WEEKOFYEAR(day_enrolled)FROM studentsWHERE WEEKOFYEAR(day_enrolled) < 26; +----------+--------------------------+| fname | WEEKOFYEAR(day_enrolled) |+----------+--------------------------+| Ben | 16 || Arthur | 13 || Benjamin | 1 |+----------+--------------------------+ ```

To return week number from a datetime:

``` SELECT WEEKOFYEAR('2020-04-12 06:05:55'); +-----------------------------------+| WEEKOFYEAR('2020-04-12 06:05:55') |+-----------------------------------+| 15 |+-----------------------------------+ ```
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