How would I get the birthdays of friends who are celebrating their birthday this week, this month and next month using MYSQL and PHP?

Question

I am currently working in an site which needs to get the birthdays of friends who are celebrating their birthday this week, this month and next month using MYSQL and PHP.

Answer 1

Provided you store birthdates in DATE (or DATETIME) format in MySQL you can use the following Queries:

// This week
SELECT * FROM person WHERE WEEK( birthdate ) = WEEK( NOW() )

// This month
SELECT * FROM person WHERE MONTH( birthdate ) = MONTH( NOW() )

// Next month

SELECT * FROM person WHERE MONTH( birthdate ) = MONTH( NOW() ) + 1;

SELECT * FROM person WHERE IF
  ( MONTH( NOW() ) < 12, MONTH( birthdate ) = MONTH( NOW() ) + 1,
  MONTH( birthdate ) = 1)

Answer 2

SELECT  *
FROM    users
WHERE   birthday + INTERVAL YEAR(CURRENT_DATE) - YEAR(birthday) YEAR BETWEEN CURRENT_DATE AND CURRENT_DATE + INTERVAL 3 DAY

Note that this condition is not sargable and requires full indes scan.

In SQL Server, Oracle and PostgreSQL this can be improved using this approach:

• Selecting birthdays

, but MySQL lacks a way to generate a random resultset.

However, you can create a dummy table and store years from 1900 to 2100 in it.

Add a cron task to update it in 2100 since you can forget easily :)