Dropdownlist中的SQL联合之间的文本-ASP.net C＃

Question

I have a SQL query which brings back staff which are most important and should appear at top of the dropdown list, then all other staff below this.

The query is built using unions to collect both queries together.

I would like to have text at the top of the dropdownlist and text in between the unions. Is this possible?

EG "Preferred Staff Members" as the top and "All Other Staff members" to separate the two unions

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

You can add a dummy select in between

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

In your case this would look something like this

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

Your best bet may be to include some sort of Sort Order field in each of your queries. Maybe an identifier such as an astrick marking them preferred.

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

UNION

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

Then you can use a sort by in your code to sort first by the sort order, then by name.

Answer 3

Can you try following

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

You can then easily identify which option is selected by (0 or -1)