# How the WEEKOFYEAR() function works in Mariadb?

The `WEEKOFYEAR()`

function in MariaDB is used to return the week number for a given date.

The `WEEKOFYEAR()`

function in MariaDB is used to return the week number for a given date. This function considers the week containing January 1 as the first week of the year, and returns a number from 1 to 53.

## Syntax

The syntax for the MariaDB `WEEKOFYEAR()`

function is as follows:

```
WEEKOFYEAR(date)
```

Where `date`

is the date or datetime value from which you want to determine the week number.

## Examples

### Example 1: Basic Usage of `WEEKOFYEAR()`

This example shows how to get the week number for a specific date.

```
SELECT WEEKOFYEAR('2024-01-01') AS week_number;
```

Below is the output for the statement:

```
+-------------+
| week_number |
+-------------+
| 1 |
+-------------+
```

This indicates that January 1, 2024, falls in the first week of the year.

### Example 2: Using `WEEKOFYEAR()`

with a Table

Let’s create a table with dates and use the `WEEKOFYEAR()`

function to find their corresponding week numbers.

```
DROP TABLE IF EXISTS example_dates;
CREATE TABLE example_dates (date_value DATE);
INSERT INTO example_dates VALUES ('2024-01-01'), ('2024-07-01'), ('2024-12-31');
```

Now, we query the table:

```
SELECT date_value, WEEKOFYEAR(date_value) AS week_number FROM example_dates;
```

Below is the output for the statement:

```
+------------+-------------+
| date_value | week_number |
+------------+-------------+
| 2024-01-01 | 1 |
| 2024-07-01 | 27 |
| 2024-12-31 | 1 |
+------------+-------------+
```

The output shows the week number for each date in the table.

### Example 3: `WEEKOFYEAR()`

with Current Date

To find the week number of the current date:

```
SELECT WEEKOFYEAR(CURDATE()) AS week_number;
```

The output will show the week number for today’s date.

### Example 4: `WEEKOFYEAR()`

in a WHERE Clause

You can use the `WEEKOFYEAR()`

function in a `WHERE`

clause to filter results based on the week number.

```
SELECT * FROM example_dates WHERE WEEKOFYEAR(date_value) = 52;
```

This will return rows where the `date_value`

falls in the 52nd week of the year.

### Example 5: `WEEKOFYEAR()`

with `ORDER BY`

Sorting records by the week number:

```
SELECT * FROM example_dates ORDER BY WEEKOFYEAR(date_value);
```

This will sort the results starting with the earliest week number.

## Related Functions

Below are a few functions related to the MariaDB `WEEKOFYEAR()`

function:

- MariaDB
`YEARWEEK()`

function returns the year and week number for a given date. - MariaDB
`WEEK()`

function returns the week number for a given date, with options to define the start of the week and whether the week is returned as 0-53 or 1-53. - MariaDB
`DAYOFYEAR()`

function returns the day of the year for a given date.

## Conclusion

The `WEEKOFYEAR()`

function is a useful tool in MariaDB for working with date-related data, especially when you need to organize or analyze data on a weekly basis. With the examples provided, you should be able to apply this function effectively in your database queries.