使用SELECT查询的结果作为INSERT查询中的值

Question

是否可以将查询结果用作INSERT查询中字段的值？这是我想要实现的目标，但我是以正确的方式进行的吗？

INSERT INTO tblCounts ( CategoryID, GroupID, CountNo )
VALUES (DMAX("CategoryID","tblCategories"), (SELECT GroupID from tblGroups), 0);

Answer 1

你应该用这个：

INSERT INTO tblCounts ( CategoryID, GroupID, CountNo )
select DMAX("CategoryID","tblCategories"), GroupID, 0
from tblGroups;

但似乎DMAX是Access function，而不是MySQL？

对于CountNo为3且CategoryID为2的条件，您应该在select查询中添加where子句，如下所示：

INSERT INTO tblCounts ( CategoryID, GroupID, CountNo )
select DMAX("CategoryID","tblCategories"), GroupID, 0  -- select 2, GroupID, 3 from tblgroups where CategoryID = 2 and CountNo = 3--?
from tblGroups
where CategoryID = 2 and CountNo = 3;