Question

我无法在同一个select语句中的行号上使用where条件。如果我使用不同的select语句在rownumber上应用条件，结果就不一致了......

quantity

SELECT TOP (@lastrow - 1) c.totalRows ,c.ae_effective_enrollment_id ,c.[user_id] ,c.login_name ,c.first_name ,c.last_name ,cm.courseware_title ,cm.courseware_code ,@courseware_id assetId ,c.enrollment_status_id ,CASE WHEN c.enrollment_status_id = 2 AND c.is_self_enrolled = 0 THEN 'Admin-' + s.description WHEN c.enrollment_status_id = 2 AND c.is_self_enrolled = 1 THEN 'Self-' + s.description ELSE s.description END AS enrollmentStatus ,c.is_group ,CASE WHEN c.is_self_enrolled = 0 THEN 1 ELSE 0 END is_admin ,CASE WHEN c.auma_is_assigned = 1 THEN 'Admin-assigned' WHEN c.auma_is_assigned = 0 THEN 'Self-assigned' ELSE 'No-My-Plan' END AS myplanStatus , master_assignment_id ,ROW_NUMBER() over(partition by cm.courseware_id,c.user_id order by c.is_self_enrolled)as check_row FROM enrollmentCTE c INNER JOIN dbo.courseware_master cm ON cm.courseware_id = @courseware_id LEFT JOIN @statuscodes s ON s.id = c.enrollment_status_id WHERE check_row=1 and enrollment_status_id<>4 and rownumber > @firstrow AND rownumber < @lastrow ORDER BY rownumber此处无法识别。请帮忙

Answer 1

SQL执行顺序。

FROM条款

WHERE条款

GROUP BY条款

HAVING条款

SELECT条款

ORDER BY条款

check_row别名是在 select 部分中进行的，因此它在上下文中尚不存在

修改做了一些测试。似乎无法做对。作为临时解决方案，您可以尝试使用

ROW_NUMBER() over(...
where子句中的
以及

修改 MSDN website中的另一个选项是

返回行的子集

以下示例按OrderDate的顺序计算SalesOrderHeader表中所有行的行号，并仅返回50到60行。

USE AdventureWorks2012; GO WITH OrderedOrders AS ( SELECT SalesOrderID, OrderDate, ROW_NUMBER() OVER (ORDER BY OrderDate) AS RowNumber FROM Sales.SalesOrderHeader ) SELECT SalesOrderID, OrderDate, RowNumber FROM OrderedOrders WHERE RowNumber BETWEEN 50 AND 60;

Answer 2

SELECT totalRows, ae_effective_enrollment_id, user_id, login_name, first_name, last_name, check_row FROM 
(SELECT TOP (@lastrow - 1) c.totalRows as totalRows 
        ,c.ae_effective_enrollment_id as ae_effective_enrollment_id
        ,c.[user_id] as user_id
        ,c.login_name as login_name
        ,c.first_name as first_name
        ,c.last_name as last_name
        ,cm.courseware_title as courseware_title
        ,cm.courseware_code as courseware_code
        ,@courseware_id as assetId
        ,c.enrollment_status_id as enrollment_status_id
        ,CASE 
            WHEN c.enrollment_status_id = 2
                AND c.is_self_enrolled = 0
                THEN 'Admin-' + s.description
            WHEN c.enrollment_status_id = 2
                AND c.is_self_enrolled = 1
                THEN 'Self-' + s.description
            ELSE s.description
            END AS enrollmentStatus
        ,c.is_group
        ,CASE 
            WHEN c.is_self_enrolled = 0
                THEN 1
            ELSE 0
            END is_admin
        ,CASE 
            WHEN c.auma_is_assigned = 1
                THEN 'Admin-assigned'
            WHEN c.auma_is_assigned = 0
                THEN 'Self-assigned'
            ELSE 'No-My-Plan'
            END AS myplanStatus
        , master_assignment_id
        ,ROW_NUMBER() over(partition by cm.courseware_id,c.user_id order by c.is_self_enrolled)as check_row
    FROM enrollmentCTE c
    INNER JOIN dbo.courseware_master cm ON cm.courseware_id = @courseware_id
    LEFT JOIN @statuscodes s ON s.id = c.enrollment_status_id
    WHERE enrollment_status_id<>4 and
    rownumber > @firstrow
        AND rownumber < @lastrow
    ORDER BY rownumber ) t where check_row = 1

注意 - 在第一个选择语句中添加所有列名

Answer 3

使用CTE根据其他

进行查询

;WITH CTE AS(
    SELECT  c.totalRows
            ,c.ae_effective_enrollment_id
            ,c.[user_id]
            ,c.login_name
            ,c.first_name
            ,c.last_name
            ,cm.courseware_title
            ,cm.courseware_code
            ,@courseware_id assetId
            ,c.enrollment_status_id
            ,CASE 
                WHEN c.enrollment_status_id = 2
                    AND c.is_self_enrolled = 0
                    THEN 'Admin-' + s.description
                WHEN c.enrollment_status_id = 2
                    AND c.is_self_enrolled = 1
                    THEN 'Self-' + s.description
                ELSE s.description
                END AS enrollmentStatus
            ,c.is_group
            ,CASE 
                WHEN c.is_self_enrolled = 0
                    THEN 1
                ELSE 0
                END is_admin
            ,CASE 
                WHEN c.auma_is_assigned = 1
                    THEN 'Admin-assigned'
                WHEN c.auma_is_assigned = 0
                    THEN 'Self-assigned'
                ELSE 'No-My-Plan'
                END AS myplanStatus
            , master_assignment_id
            ,ROW_NUMBER() over(partition by cm.courseware_id,c.user_id order by c.is_self_enrolled) as check_row
    FROM enrollmentCTE c
    INNER JOIN dbo.courseware_master cm ON cm.courseware_id = @courseware_id
    LEFT JOIN @statuscodes s ON s.id = c.enrollment_status_id
    WHERE enrollment_status_id<>4
    AND rownumber > @firstrow
    AND rownumber < @lastrow
)
SELECT TOP (@lastrow - 1) *
FROM CTE
WHERE check_row = 1
ORDER BY rownumber

如何在同一个select语句中的row_number上有where子句？

3 个答案: