Question

此刻，我正在尝试创建一个视图，将所有“默认”信息集中在一个地方。但是，棘手的部分是我想根据它们是否处于活动状态，将表1中的某些行动态连接起来。

CREATE VIEW [dbo].[BaseDefaults] AS
SELECT
    dt.Rate,
    dt2.Growth,
    dt3.Value,
    dt4.Period,
    dt5.Type,
    dt5.TypeValue,
    // dynamically select those added from the dynamic join below
FROM (
        SELECT defaultValue AS Rate, ROW_NUMBER() OVER(ORDER BY defaultValue) AS RowNumber 
        FROM defaultValues 
        WHERE defaultValueName = 'Rate'
     ) as dt
LEFT OUTER JOIN (
        SELECT defaultValue as Growth, ROW_NUMBER() OVER(ORDER BY defaultValue) AS RowNumber 
        FROM defaultValues 
        WHERE defaultValueName = 'Growth'
     ) as dt2
     ON dt.RowNumber = dt2.RowNumber
LEFT OUTER JOIN (
        SELECT defaultValue as Value, ROW_NUMBER() OVER(ORDER BY defaultValue) AS RowNumber 
        FROM defaultValues 
        WHERE defaultValueName = 'Value'
     ) as dt3
     ON dt2.RowNumber = dt3.RowNumber
LEFT OUTER JOIN (
        SELECT Period, ROW_NUMBER() OVER(ORDER BY Period) AS RowNumber 
        FROM Period 
        WHERE isDefault = 1
     ) as dt4
     ON dt3.RowNumber = dt4.RowNumber
LEFT OUTER JOIN (
        SELECT Type, defaultValue as TypeValue, ROW_NUMBER() OVER(ORDER BY Type) AS RowNumber 
        FROM Types 
        WHERE isDefault = 1
     ) as dt5
     ON dt4.RowNumber = dt5.RowNumber
// here I want to dynamically add all values as a column that are returned from
// SELECT defaultValueName, defaultValue
// FROM AnotherTable
// WHERE IsActive = 1

这可能吗？

我希望有这样的东西：

Rate   Growth   Value   Period   Type     TypeValue DynamicV1 DynamicV2
0.1    0.2      10      5        Percent  0.2       0.2       0.3

仅在最终的保留连接中从选择查询返回的情况下才选择并添加DynamicV1和DynamicV2

如何动态地将联接添加到查询？

0 个答案: