[英]Only fetch Max and Min value in column - SQL
在這里我提到一個數據,我只想將最大和最小日期值作為單行提取到我的新表中。
ID date Comment grade
1 12-Jul-2013 asdads 1
1 2-Apr-2014 dfgdfg 1
1 29-Dec-2014 ghjghj 2
10 8-Oct-2015 cbvcvb 1
10 10-Jan-2017 sdfsdf 5
10 29-May-2018 ertert 4
我想按 ID 按數據分組。 作為 ID Date1 Date2 Comment1 comment2 Grade1 Grade2
請幫我解決這個案子。 提前致謝。
您可以將以下 SQL 語句與子查詢一起使用:
select q.* ,
( select comment from tab where ID = q.ID and date = q.date1 ) as comment1,
( select comment from tab where ID = q.ID and date = q.date2 ) as comment2,
( select grade from tab where ID = q.ID and date = q.date1 ) as grade1,
( select grade from tab where ID = q.ID and date = q.date2 ) as grade2
from
(
select ID, min(date) as date1, max(date) as date2
from tab
group by ID
) q
ID date1 date2 comment1 comment2 grade1 grade2
1 12.07.2013 29.12.2014 asdads ghjghj 1 2
10 08.10.2015 29.05.2018 cbvcvb ertert 1 4
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