MySQL查詢統計，統計唯一值並分組

做個筆記

sqlyog客戶端訪問mysql伺服器

統計資料：次數總數， 次數成功率，物件(obj)總數，物件(obj)成功率

要求：按時間排序和分組

sql語句如下：

1

select
2 a.date as
`日期`,
3 a.total as
`總次數`,
4 a.objs as
`總物件數`,
5round(a.failed / a.total *
100, 2) as
`失敗次數比率`,
6round(a.obj_failed/ a.objs *
100, 2) as
`物件失敗率`
7from
8 (select
9count(1) as
`total`,
10count(distinct(`obj_id`)) as
`objs`,
11count(if(`description` like
'%object failed%
', 1, null)) as
`failed`,
12count(distinct(if(`description` like
'%object failed%
', `obj_id`, null))) as
`obj_failed`,
13 date(`created_at`) as
`date`
14from `mydb.my_table` where `created_at` >
'2016-03-07 0'15
group
by`date`
16order
by `date` desc)17
as a

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