本查詢是計算兩個表的相同時間(天)的記錄數

1.合并就用UNION ALL

第一個查詢:

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

count(*)

FROM bind_hist

GROUP BY time

第二個查詢:

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

count(*)

FROM bind_failed

GROUP BY time

合并后為:

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

0 as failed,

count(*) hist

FROM bind_hist

GROUP BY time

UNION ALL

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

count(*) failed,

0

FROM bind_failed

GROUP BY time這里使用0 as failed作用是可以展示第二個查詢的數值,因為UNION ALL本身只顯示第一個查詢的列

2.將合并后的結果作為一個表,再根據時間GROUP BY,求和值

SELECT

r.time,

SUM(r.failed),

SUM(r.hist)

FROM (

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

0 as failed,

count(*) hist

FROM bind_hist

GROUP BY time

UNION ALL

SELECT

DATE_FORMAT(BIND_TIME,'%Y-%m-%d') time,

count(*) failed,

0

FROM bind_failed

GROUP BY time

) r

GROUP BY r.time

總結

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