How to count total number of record for each 7 days in mysql

Question

i trying to get data from database with counting the total number start from today and auto reduce 1 days and count for 7 time. It will display like

Monday    = 5
Tuesday   = 2
Wednesday = 6
Thursday  = 4
Friday    = 7
Saturday  = 1
Sunday    = 5

The problems is when my using the query below

SELECT count(*), ad_date 
  FROM advertise
 WHERE ad_date >=ad_date(day,datediff(day,0,GetDate())- 7,0)

It showing error:

Incorrect parameter count in the call to native function 'datediff'

So what is the problems for this or any alternative query for my problems?

The format of my date table is using timestamp.

2016-03-23 14:27:28 
2016-03-25 18:27:28 
2016-03-26 18:27:28`

Answer 1

datediff has only two parameters

DATEDIFF(date1,date2)

1. startdate where you want to starts from
2. EndDate

Replace:

datediff(day,0,GetDate())- 7,0)

With:

DATE(DATE_SUB(NOW(),INTERVAL 7 DAY),GetDate())

Updated Answer (Try This):

SELECT COUNT(1)
FROM table_name
WHERE created_date > (NOW() - INTERVAL 7 DAY)
Group by created_date