从上周的mysql查询中选择数据

Question

I have a table with a datefield and I want to select all the entries that came from the last week,Saturday to Sunday(not last 7 days).

Table values

Date               ID    Value
8/3/2015 8:03 PM    a     10        
8/4/2015 8:03 PM    b     20        
8/5/2015 8:03 PM    c     30    
8/6/2015 8:03 PM    d     40    
8/7/2015 8:03 PM    e     50    
8/9/2015 8:03 PM    f     60        
8/10/2015 8:03 PM   g     70    

I only want to select id from last which are a,b,c,d,e. How do i write the mysql query in this ?

Answer 1

This is a bit tricky. One method is to try something like week() , but that has a problem at the beginning of the year.

Another approach is to get the date of midnight on Sunday and use that for the calculation. I think this expression does that:

 date_sub(curdate(), interval (weekday(curdate()) + 1) % 7) - 1 day)

You can then plug this into the where clause:

select v.*
from values v
where v.date < date_sub(curdate(), interval (weekday(curdate()) + 1) % 7) - 1 day) and
      v.date >= date_sub(curdate(), interval (weekday(curdate()) + 1) % 7) - 8 day);

Note: this formulation can make use of an index on date .