Sybase
返回列的最大值
桌子:
SubSection | TradingId | Year | Amount 100A 5001 2004 -120 200B 5001 2005 -130 300C 5002 2006 -140 300C 5003 2007 -150
我想根據小節返回 MAX 交易 ID,我想要這個:
SubSection | TradingId | Year | Amount 100A 5001 2004 -120 200B 5001 2005 -130 300C 5003 2007 -150
我嘗試使用 GROUPBY 小節選擇 MAX,嘗試 HAVING MAX 等但沒有運氣
SELECT t1.* FROM the_table t1 WHERE t1.trading_id = (SELECT max(t2.trading_id) FROM the_table t2 WHERE t2.subsection = t1.subsection)
這將返回表中的所有列,但對於每個子部分的最大交易 ID:
Select t2.* from ( Select max(TradingId) as MaxTradingId, SubSection from TableT group by SubSection ) t1 join TableT t2 on t1.MaxTradingId = t2.TradingId and t1.SubSection = t2.SubSection
請試一試。