如何以列名作为第一行返回 T-SQL 查询

Question

我正在编写一个 SSIS 包以将数据从 SQL Server 2012 数据库输出到客户端的 .CSV 文件。要求是第一行是列名。下面是我为数据流任务中的源编写的查询。问题是，它总是将列名作为最后一行返回，而不是第一行。为什么？我如何做到这一点？

DECLARE @Today AS DateTime= GETDATE()
DECLARE @NextPayrollDate AS DateTime

EXEC mobile.getNextPayrollDate @Today, @NextPayrollDate OUTPUT

;WITH LatestEligible (EmployeeID, LatestBillVerified) AS
(
    SELECT 
        EmployeeID, MAX(DateBillVerified) AS LatestBillVerified
    FROM 
        Inv_DataReimbursement
    GROUP BY 
        EmployeeID
)
SELECT
    'Edit Set' AS 'Edit Set', 
    'Employee No.' AS 'Employee No.'
FROM 
    LatestEligible

UNION

SELECT 
    NULL AS 'Edit Set',
    d.EmployeeID AS 'Employee No.'
FROM 
    LatestEligible d
INNER JOIN 
    Employee e ON d.EmployeeID = e.EmployeeID
INNER JOIN 
    Inv_DataReimbursement dr ON d.EmployeeID = dr.EmployeeID 
                             AND d.LatestBillVerified = dr.DateBillVerified
WHERE 
    (dr.MonthlyServiceEligible = 'true'
     OR (dr.MonthlyServiceEligible = 'false' 
         AND e.DateEnd IS NOT NULL 
         AND e.DateEnd > @NextPayrollDate))
    AND dr.ActualAmount > 0

Answer 1

我如何做到这一点？

不要通过 SQL 来做。

只需勾选Flat File Connection Manager 中的第一个数据行中的列名框，保持原始查询不变。

然后将自动添加列标题，而无需合并这些额外的元数据（并可能在 SQL 端将所有内容转换为字符串）。

Answer 2

你可以试试UNION ALL:

SELECT
'Edit Set' AS 'Edit Set', 'Employee No.' AS 'Employee No.'
FROM LatestEligible
UNION ALL
SELECT DISTINCT
NULL AS 'Edit Set',
d.EmployeeID AS 'Employee No.'
FROM LatestEligible d
INNER JOIN Employee e
ON d.EmployeeID = e.EmployeeID
INNER JOIN Inv_DataReimbursement dr
ON d.EmployeeID = dr.EmployeeID AND d.LatestBillVerified = 
dr.DateBillVerified
WHERE (dr.MonthlyServiceEligible = 'true'
OR (dr.MonthlyServiceEligible = 'false' AND e.DateEnd IS NOT NULL AND 
e.DateEnd > @NextPayrollDate))
AND dr.ActualAmount > 0