sql-server-2008 - 简单的 T-sql 查询

Question

从上面的示例数据中，我想编写一个查询，如果 ExpRow 值 = 1，则将 SalesAmount 返回为 0.0，如果 ExpRow 值 = 2，则将 ExpenseAmount 返回为 0.0

Answer 1

SELECT
    ExpRow,
    ExpenseDate,
    CASE WHEN ExpRow = 2 THEN 0 ELSE ExpenseAmount END AS ExpenseAmount,
    CASE WHEN ExpRow = 1 THEN 0 ELSE SalesAmount END AS SalesAmount
FROM
    Table

Answer 2

不确定这是否正是您所追求的，但是...

SELECT CASE([ExpRow]) WHEN 1 THEN 0 ELSE SalesAmount END AS 'SalesAmount',
       CASE([ExpRow]) WHEN 2 THEN 0 ELSE ExpenseAmount END AS 'ExpenseAmount'
FROM [YOUR_TABLE]