MySQL-上周的第一天和最后一天

Question

I am trying to get the first and last day of the previous week in MySQL, where the first and last days are Monday and Sunday, respectively.

For example if today (March 1, 2017) is when the SQL is executed I would like to obtain:

• FirstDay --> Feb 20
• LastDay --> Feb 26

I have tried the following and all sorts of variations with this, without success.

SELECT DATE_ADD(curdate(), INTERVAL(-WEEKDAY(curdate())) DAY); 

Is it possible to achieve these results when executed anytime within the current week?

Answer 1

Selecting first and last day of previous week:

SELECT
 (curdate() - INTERVAL((WEEKDAY(curdate()))+1) DAY) as e,
 (curdate() - INTERVAL((WEEKDAY(curdate()))+7) DAY) as s

s: 2017-02-20

e: 2017-02-26

And if you want filter last week table rows:

SELECT * FROM tblName
WHERE dateCol >= (curdate() - INTERVAL((WEEKDAY(curdate()))+7) DAY)
  AND dateCol < (curdate() - INTERVAL((WEEKDAY(curdate()))+1) DAY)
ORDER BY dateCol DESC -- or ASC

Answer 2

Here you go:

SELECT FirstDay, DATE_ADD(FirstDay, INTERVAL 6 DAY) as LastDay
FROM(
SELECT DATE_ADD(DATE_SUB(NOW(), INTERVAL WEEKDAY(NOW()) DAY), INTERVAL -1 WEEK) as FirstDay) a

Here's the SQL Fiddle .

Answer 3

First day of the previous week

SELECT SUBDATE(SUBDATE(CURDATE(),7), WEEKDAY(CURDATE()));

Last day of the previous week

SELECT ADDDATE(SUBDATE(CURDATE(),7), 6 - WEEKDAY(CURDATE()));