[英]Query to find the missing dates of a month in Oracle
這是Oracle 10g的出勤表中我的Record_Date (Date)列中的可用日期。您可以找到日期04/06/2016 08/06/2016 16/06/2016 23/06/2016 29/06/2016 are序列中缺少。
**Record_Date**
01/06/2016
02/06/2016
03/06/2016
05/06/2016
06/06/2016
07/06/2016
09/06/2016
10/06/2016
12/06/2016
13/06/2016
14/06/2016
15/06/2016
17/06/2016
18/06/2016
19/06/2016
20/06/2016
21/06/2016
22/06/2016
24/06/2016
25/06/2016
26/06/2016
27/06/2016
28/06/2016
30/06/2016
01/07/2016
我只需要查詢以查找特定月份(以及以后的年份)中缺少的日期。
請告訴我一種方法
with
nums(num )
as
(select 0 from dual
union all
select num + 1 from nums
where num < (select max(col) from qtable)- (select min(col) from qtable)
),
date_btwn(dat)
as(select num + (select min(col) from qtable) from nums)
select dat from date_btwn
minus
select col from qtable;
內聯視圖 nums將從開始日期開始生成所有要添加的數字。 date_btwn包含表中開始日期和結束日期之間的所有日期。 我們使用減號排除表中的日期。
您可以使用以下一種:
WITH all_days AS
(SELECT DATE '2016-06-01' + LEVEL-1 AS the_day
FROM dual
CONNECT BY DATE '2016-06-01' + LEVEL-1 <= DATE '2016-06-30')
SELECT the_day
FROM all_days
WHERE the_day <>ALL (SELECT Record_Date FROM Attendance);
或者,如果您希望更動態地使用它:
WITH all_days AS
(SELECT START_DATE + LEVEL AS the_day
FROM dual
CROSS JOIN
(SELECT
TRUNC(MIN(Record_Date), 'MM') -1 AS START_DATE,
TRUNC(LAST_DAY(MAX(Record_Date))) AS END_DATE
FROM Attendance)
CONNECT BY START_DATE + LEVEL <= END_DATE)
SELECT the_day
FROM all_days
WHERE the_day <>ALL (SELECT Record_Date FROM Attendance);
請注意, <>ALL
與NOT IN
相同-這只是我個人的喜好。
您需要生成所有日期,並且必須找到丟失的日期。 下面與CTE我已經做到了
使用CTE
not in
Query中:
with calendar as (
select rownum - 1 as daynum,
to_date('1-jun-2016') + (rownum - 1) as monthdate
from dual )
select monthdate as monthdate
from calendar
where monthdate not in (
SELECT
Record_Date
FROM Attendance )
and monthdate >= to_date('1-jun-2016') /* CHANGE as per need */
and monthdate < to_date('1-jul-2016') /* CHANGE as per need */
或使用CTE
並left join
查詢:
with calendar as (
select rownum - 1 as daynum,
to_date('1-jun-2016') + (rownum - 1) as monthdate
from dual )
select monthdate as monthdate
from calendar C left join Attendance A on A.Record_Date=c.monthdate
where A.Record_Date is null
and monthdate >= to_date('1-jun-2016') /* CHANGE as per need */
and monthdate < to_date('1-jul-2016') /* CHANGE as per need */
按照日期列格式,先將其更改為有效格式,再進入選擇查詢,然后再使用此查詢。
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