Question

如何将两个sql查询合并为一个：

strQuery = "select * from UNITHD where driver1medical BETWEEN '1/1/1990' and GETDATE()+29 ORDER BY driver1medical"
objMedicalDriver1.Open strQuery

和

strQuery = "select * from UNITHD where driver2medical BETWEEN '1/1/1990' and GETDATE()+29 ORDER BY driver1medical"
objMedicalDriver2.Open strQuery

我确实在stackoverflow找到了很多例子但是我无法让它工作： - （

Answer 1

select * from UNITHD
where ( driver1medical BETWEEN '1/1/1990' and GETDATE()+29 )
   or ( driver2medical BETWEEN '1/1/1990' and GETDATE()+29 )
ORDER BY driver1medical

Answer 2

这样它应该列出所有结果组合，记住要使用UNION操作数，你需要将*替换为两个查询中的属性列表，以便它们匹配（在数量和域中）：

select * from UNITHD where driver1medical BETWEEN '1/1/1990' and GETDATE()+29 ORDER BY driver1medical

UNION

select * from UNITHD where driver2medical BETWEEN '1/1/1990' and GETDATE()+29 ORDER BY driver1medical

如何组合两个SQL查询

2 个答案: