elect dd.eday as'日期',if(tp.c is null, 0, tp.c)as '访问量' from (

select 1 as eday union select 2 union select 3 union select 4 union select 5

union select 6 union select 7 union select 8 union select 9 union select 10

union select 11 union select 12 union select 13 union select 14 union select 15

union select 16 union select 17 union select 18 union select 19 union select 20

union select 21 union select 22 union select 23 union select 24 union select 25

union select 26 union select 27 union select 28 union select 29 union select 30

union select 31) dd

left join (

select DATE_FORMAT(rf.client_datetime, '%e') d , DATE_FORMAT(rf.client_datetime, '%Y%m%d')s, COUNT(*) c from  api_flow_jnl rf

where rf.client_datetime>'2014-05-01'

and rf.client_datetime

group by d) tp

on tp.d = dd.eday;