MySQL Week function is the Date Function, which is used to return the Week number of the given date. This function accepts two arguments. Second argument decides whether the Week starts with Sunday or Monday. And, the return value should be in range 0 to 53 or 1 to 53.
In this article, we will show you, How to use this Week function to get the Week number in MySQL with an example.
MySQL Week Syntax
The basic syntax of the Week() Function in MySQL is as shown below:
Here, Mode is an optional argument. The following table will show you the Mode argument return values. For example, if Mode = 0 then week starts on Sunday, and return value is between 0 and 53.
|Mode||First Day of the Week||Range||Week 1 is the First Week…|
|0||Sunday||0 – 53||Sunday in the Given Year|
|1||Monday||0 – 53||with 4 or more days this Year|
|2||Sunday||1 – 53||Sunday in the Given 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||Monday in the Given Year|
|6||Sunday||1 – 53||with 4 or more days this Year|
|7||Monday||1 – 53||Monday in the Given Year|
MySQL Week function Example
The following examples helps you understand the use of this MySQL week function. Here, we are returning the week number without Mode argument, and with mode argument.
SELECT WEEK('2019-02-21', 0);
SELECT WEEK('2019-02-21', 1);
Let us see another example of the MySQL Week function.
SELECT WEEK('2018-12-31', 1);
SELECT WEEK('2018-12-31', 2);
SELECT WEEK('2018-12-31', 3);
MySQL Week Example 2
Let us see another example of the MySQL Week function. This time, we are using few more mode values, and different dates.
SELECT WEEK('2018-10-31', 4);
SELECT WEEK('2018-05-24', 1);
SELECT WEEK('2018-02-02', 3);
MySQL Week function will return 0, if the date falls on last week of the previous week. To avoid this, you can use 2, 3, 6 or 7 as a Mode argument value.
SELECT WEEK('2018-01-01', 0);
SELECT WEEK('2018-01-01', 2);
SELECT WEEK('2018-01-01', 6);
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