表A:ID (主键)tableaA_ID | Name | serialSQL语句:select ID , Name , ( select ISNULL(MAX(serial),0)+1 from table_B )from Table_A
insert into by select data from for
我创建了两个表,T1和T2,每个表都有一个列,分别是abc和xyz。我在每个表中插入了2行(数值1和2)。当我运行命令"select abc from t2"时,它会抛出一个错误,说明表T2中不存在列abc。但是,当我运行命令"delete from t1 where abc in (SELECT abc from