Dropdownlist中的SQL联合之间的文本-ASP.net C＃

Question

我有一个SQL查询，该查询带回了最重要的人员，这些人员应出现在下拉列表的顶部，然后是此下方的所有其他人员。

该查询使用联合来构建，以将两个查询一起收集。

我想在下拉列表的顶部放置文本，在工会之间添加文本。 这可能吗？

EG“首选工作人员”为最高职位，“其他所有工作人员”将两个工会分开

select DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name
from EMPLOYEE_TABLE e

where e.ID = @ID
and e.DATE_LEFT IS NULL or e.DATE_LEFT > GETDATE()

UNION ALL

select DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name
from EMPLOYEE_TABLE e
where e.DATE_LEFT IS NULL or e.DATE_LEFT > GETDATE()
ORDER BY Name    

Answer 1

您可以在两者之间添加一个虚拟选择

SELECT 'Name 1' AS A, 1 AS sortOrder
UNION ALL
SELECT '----' AS B, 2 AS sortOrder
UNION ALL
SELECT 'Name 2' AS C, 3 AS sortOrder
ORDER BY sortOrder, A

在你的情况下，看起来像这样

SELECT DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name, 1 AS sortOrderFROM EMPLOYEE_TABLE e
UNION ALL
SELECT '----', '----' AS B, 2 AS sortOrder
UNION ALL
SELECT DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name, 3 AS sortOrderFROM EMPLOYEE_TABLE e
ORDER BY sortOrder, Name

Answer 2

最好的选择是在每个查询中都包含某种“排序顺序”字段。 也许是像星号这样的标识符标记了它们的首选。

-- Preferred Employees
SELECT '* ' + NameInfo, 1
FROM Employees
WHERE YaddaYadda

UNION

-- Normal Employees
SELECT NameInfo, 2
FROM Employees
WHERE YaddaYadda

然后，您可以在代码中使用sort by，以先按排序顺序排序，然后再按名称排序。

Answer 3

你可以尝试跟随

SELECT 0, 'Preferred Staff Members' 
UNION ALL
select DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name
from EMPLOYEE_TABLE e

where e.ID = @ID
and e.DATE_LEFT IS NULL or e.DATE_LEFT > GETDATE()

UNION ALL

SELECT -1, 'All Other Staff members' 
UNION ALL


select DISTINCT e.EMPLOY_REF, e.FORENAME + ' ' + e.SURNAME as Name
from EMPLOYEE_TABLE e
where e.DATE_LEFT IS NULL or e.DATE_LEFT > GETDATE()
ORDER BY Name

然后，您可以轻松识别由（0或-1）选择的选项