单行到多列多行

Question

我有一个名为 Test 的 SQL 服务器 table，带有以下示例数据：

LineNo  BaseJanuary BaseFebruary    BudgetJanuary   BudgetFebruary
1       10000       20000           30000           40000
2       70000       80000           90000           100000

我想在 SQL 服务器视图（或临时 table 等）中创建以下结构，但我被卡住了...任何 ideas/suggestions 将不胜感激!

LineNo  Month       Base    Budget
1       January     10000   30000
2       January     70000   90000
1       February    20000   40000
2       February    80000   100000

注意：数字仅供参考，数据是动态的。

Answer 1

select LineNo,
       'January' as Month,
       BaseJanuary as Base,
       BudgetJanuary as Budget
  from test
union
select LineNo,
       'February' as Month,
       BaseFebruary as Base,
       BudgetFebruary as Budget
  from test
 order by LineNo, Month

Answer 2

SELECT LineNo, 'January' AS Month, BaseJanuary, BudgetFebruary
FROM Test
ORDER BY LineNo
UNION ALL
SELECT LineNo, 'February' AS Month, BaseFebruary, BudgetFebruary 
FROM Test
ORDER BY LineNo

Answer 3

CROSS APPLY可用于UNPIVOT数据：

SELECT [LineNo], [Month], Base, Budget
FROM test
CROSS APPLY(VALUES -- unpivot columns into rows
    ('January', BaseJanuary, BudgetJanuary) -- generate row for jan
  , ('February', BaseFebruary, BudgetFebruary) -- generate row for feb
) ca ([Month], Base, Budget)

单行到多列多行

Single row to multiple columns and rows

sql

sql-server

unpivot