Question

我有以下SQL查询：

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从1-10输出数字

我想我想在clock_pos上预先形成一个CASE语句

SELECT IIF(clock_to - clock_at_from < 0,
           12 - (clock_at_from - clock_to),
           clock_to - clock_at_from) AS clock_pos
FROM Condition

然后将最终结果作为条件表中的新列添加回来......

然而，我不确定如何使用名为clock_pos的结果或者如果有更好的方法来写这个。

@EDIT根据TONY Nested如果尝试。我无法再制作一个If语句

If clock_pos = 1 value = 3
If clock_pos = 2 value = 4
If clock_pos > 3 value = 5

Answer 1

MS Access SQL实际上允许在同一查询中使用计算列：

SELECT IIF(clock_to - clock_at_from < 0,
           12 - (clock_at_from - clock_to),
           clock_to - clock_at_from) AS clock_pos,
       IIF(clock_pos = 1, 3,
           IIF(clock_pos = 2, 4,
               IIF(clock_pos > 3, 5, NULL))) As clock_pos_value
FROM Condition

Answer 2

如果使用子查询，将CASE逻辑转换为嵌套IIF()似乎很简单：

SELECT IIF(clock_pos = 1, 3
            IIF(clock_pos = 2, 4,
                IIF(clock_pos > 3, 5, NULL)
               )
          ) as [value]
FROM (SELECT IIF(clock_to - clock_at_from < 0,
                 IIF(12 - (clock_at_from - clock_to) >= 3,
                     5, 12 - (clock_at_from - clock_to)
                    ), clock_to - clock_at_from
                ) as clock_pos
      FROM Conditions
     ) as c

关于结果的SQL案例声明

2 个答案: