Tutorials References Exercises Videos Menu
Create Website Get Certified Upgrade

SQL Tutorial

SQL HOME SQL Intro SQL Syntax SQL Select SQL Select Distinct SQL Where SQL And, Or, Not SQL Order By SQL Insert Into SQL Null Values SQL Update SQL Delete SQL Select Top SQL Min and Max SQL Count, Avg, Sum SQL Like SQL Wildcards SQL In SQL Between SQL Aliases SQL Joins SQL Inner Join SQL Left Join SQL Right Join SQL Full Join SQL Self Join SQL Union SQL Group By SQL Having SQL Exists SQL Any, All SQL Select Into SQL Insert Into Select SQL Case SQL Null Functions SQL Stored Procedures SQL Comments SQL Operators

SQL Database

SQL Create DB SQL Drop DB SQL Backup DB SQL Create Table SQL Drop Table SQL Alter Table SQL Constraints SQL Not Null SQL Unique SQL Primary Key SQL Foreign Key SQL Check SQL Default SQL Index SQL Auto Increment SQL Dates SQL Views SQL Injection SQL Hosting SQL Data Types

SQL References

SQL Keywords MySQL Functions SQL Server Functions MS Access Functions SQL Quick Ref

SQL Examples

SQL Examples SQL Quiz SQL Exercises SQL Certificate

MySQL WEEK() Function

Example

Return the week number for a date:

SELECT WEEK("2017-06-15");
Try it Yourself »

Definition and Usage

The WEEK() function returns the week number for a given date (a number from 0 to 53).

Syntax

WEEK(date, firstdayofweek)

Parameter Values

Parameter Description
date Required.  The date or datetime to extract the week number form
firstdayofweek

Optional. Specifies what day the week starts on. Can be one of the following:

  • 0 - First day of week is Sunday
  • 1 - First day of week is Monday and the first week of the year has more than 3 days
  • 2 - First day of week is Sunday
  • 3 - First day of week is Monday and the first week of the year has more than 3 days
  • 4 - First day of week is Sunday and the first week of the year has more than 3 days
  • 5 - First day of week is Monday
  • 6 - First day of week is Sunday and the first week of the year has more than 3 days
  • 7 - First day of week is Monday

Technical Details

Works in: From MySQL 4.0

More Examples

Example

Return the week number for a date:

SELECT WEEK("2017-10-25");
Try it Yourself »

Example

Return the week number for the current system date:

SELECT WEEK(CURDATE());
Try it Yourself »