两个表中的SQL SELECT语句

Question

我有两个select语句，我想要grep两个表的结果，然后显示一个下拉框。我可以为每个SELECT语句执行此操作，但我无法同时从两个语句中进行选择。

以下是我的2个SELECT语句：

string loggedIn= (User.Identity.Name);

SELECT DISTINCT ReportTitle from HRPastReports WHERE [username] LIKE '%" + loggedIn + "%'";
SELECT DISTINCT ReportTitle from FinancePastReports WHERE [username] LIKE '%" + loggedIn+ "%'";

如何将SELECT语句合并为一个语句？

谢谢

Answer 1

您只能通过UNION执行此操作，因为您引用了两个不同的表

SELECT DISTINCT ReportTitle from HRPastReports WHERE [username] LIKE '%" + loggedIn + "%'";
UNION
SELECT DISTINCT ReportTitle from FinancePastReports WHERE [username] LIKE '%" + loggedIn+ "%'";

Answer 2

您可以使用UNION运算符

SELECT DISTINCT ReportTitle from HRPastReports WHERE [username] LIKE '%" + loggedIn + "%'";
union all
SELECT DISTINCT ReportTitle from FinancePastReports WHERE [username] LIKE '%" + loggedIn+ "%'";