嗨,我在以下查询中遇到了问题:set somecol = somecol from tblgroup by key and Time = (selectmax(time) from tbl)
当只有一个键时,上面的查询可以正常工作如何存储来自select子查询的多个值?同时,时间列也可以是多个。我对sql很陌生。请
这是我要写的查询,我知道如何定义字段、关系和谓词表达式。select UserId, TransactionId from where TransactionId inselect MaxId as TransactionIdfromFROM [UserTransaction]innerMaxId as Tran
我使用了许多select语句来驱动结果,但是我有两个select语句,它们返回约会的最短时间和最长时间。但是,在最小和最大值相同的情况下,我想从where子句中删除。SELECT users.LOCATIONID, MAX(APPOINTMENTTIMEappointments
WHERE APPOINTMENTDATE BETWEEN '2017-01-07' AND '