選擇@ t2中的所有行,其中最新/最後一個條目(即,MAX(@ t2.Id))如何選擇T2的MAX(T2.Id)作爲給定值T2.Value?
SomeValue是給定值,例如, 4
declare @t1 table (Id int not null primary key)
declare @t2 table (Id int not null primary key, Table1Id int not null, SomeValue int not null)
INSERT @t1 VALUES (100), (101), (102), (103), (104), (105), (106), (107), (108), (109), (110), (111), (112), (113)
INSERT @t2 VALUES (1,100,1),(5,100,2),(9,100,4),(10,100,5),
(2,101,1),(6,101,2),(11,101,4),(13,101,7),
(3,102,1),(7,102,2),(12,102,4),(14,102,6),
(15,103,1),(17,103,2),
(16,104,1),(18,104,2),(19,104,4),
(20,105,1),(25,105,2),(27,105,4),(28,105,7),
(21,106,1),
(22,107,1),(29,107,2),
(23,108,1),(30,108,2),
(31,109,1),
(32,110,1),(36,110,2),(40,110,3),
(33,111,1),(37,111,2),(44,111,3),
(34,112,1),(38,112,2),(43,112,4),
(35,113,1),(41,38,2),(42,39,4)
您要選擇@ t2中的所有行where(condition),@ t1的用法是什麼? – learningNew
t1.Id = t2.Table1Id,需要每個不同的t1.Id – Trober
您是否正在尋找類似的東西:select * from L1 其中L1.id =(從L2選擇MAX(L2.id)) –