考慮此表(簡化的),其可具有大量的行: CREATE TABLE v
(
m VARCHAR2(50),
ts date,
v NUMBER
)
/
然後將以下工作很大作爲查詢: SELECT
m,
MIN(ts) min_ts,
MAX(ts) max_ts
FROM
v
WHERE
TO_DATE('20
我需要幫助解決這個問題。 目前,我有這個疑問: SELECT Table1.Column1 AS Company
,SUM(DATEDIFF(Day, Table2.Column2, Table1.Column3)) AS DiffDate
FROM Table1
INNER JOIN Table2 ON Table1.Column6 = Table2.Column6
AN