Question

在SQL Server 2014上查询问题。

我在查询时遇到了一些问题，无法从各列返回MAX值。

我正在运行的当前查询在下面，这可以正常返回每个日期指定的列的最大值。

SELECT ws.ExerciseID, 
ws.Date,
(SELECT Max(v) FROM 
(VALUES (WeightReps1), (WeightReps2), (WeightReps3), (WeightReps4), (WeightReps5)
   , (WeightReps6), (WeightReps7), (WeightReps8), (WeightReps9), (WeightReps10)
) 
AS value(v)
) 
as [Max Weight]
FROM workoutsessions ws
join ExerciseCultures ec on ws.ExerciseID = ec.ExerciseID
where ec.Name = 'Bench Press'

因此，这显示了这些列的最大值。太棒了。但是，每个列的“weightreps”列都有一个“Reps”的相邻列。我需要从上面的列返回最大值，但仅限于相邻的'reps'列大于或等于某个值的位置。

我在下面提供了一个示例：

ExerciseID | WorkoutID | Date       | WeightReps1 | Reps1 | Weightreps2 | Reps2 | Weightreps3 | Reps3
105        | 201      | 11/08/2014 | 50          | 9     | 65          | 3     | 75             | 1
 105       | 202      | 13/08/2014 | 55          | 6     | 70          | 2     | 77        | 1

所以在上面的示例中，如果我只想返回'reps'列大于2的最高值。我会返回值'70'，因为这是相邻reps列等于或大于2的最高值。

我已尝试过以下代码，但这会带回任何代表列大于2的最高值 - 没有帮助。

SELECT top 1 ec.Name, Date,
  (SELECT Max(v) 
   FROM (VALUES (WeightReps1), (WeightReps2), (WeightReps3), (WeightReps4), (WeightReps5)
   , (WeightReps6), (WeightReps7), (WeightReps8), (WeightReps9), (WeightReps10)
   ) AS value(v)
   ) as [Weight]
FROM workoutsessions ws
join ExerciseCultures ec on ws.ExerciseID = ec.ExerciseID
where 
ec.Name = 'Bench Press'
and ws.reps1 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps2 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps3 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps4 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps5 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps6 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps7 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps8 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps9 >= '6'
or
ec.Name = 'Bench Press'
and ws.reps10 >= '6'
order by weight desc

我出错的任何想法？

感谢。

Answer 1

您可以更改此子查询：

SELECT Max(v)
FROM 
  (
    VALUES
      (WeightReps1), (WeightReps2), (WeightReps3), (WeightReps4), (WeightReps5),
      (WeightReps6), (WeightReps7), (WeightReps8), (WeightReps9), (WeightReps10)
  ) AS value(v)

到此：

SELECT Max(w)
FROM 
  (
    VALUES
      (WeightReps1, Reps1), (WeightReps2, Reps2),
      (WeightReps3, Reps3), (WeightReps4, Reps4),
      (WeightReps5, Reps5), (WeightReps6, Reps6),
      (WeightReps7, Reps7), (WeightReps8, Reps8),
      (WeightReps9, Reps9), (WeightReps10, Reps10)
  ) AS value(w, r)
WHERE
  r >= ... /* some value */

Answer 2

您可以在CASE子句中使用VALUES表达式：

SELECT ws.ExerciseID, 
ws.Date,
(SELECT Max(v) FROM 
(VALUES (CASE WHEN Reps1 > 6 THEN WeightReps1 ELSE NULL END), 
        (CASE WHEN Reps2 > 6 THEN WeightReps2 ELSE NULL END), 
        (CASE WHEN Reps3 > 6 THEN WeightReps3 ELSE NULL END), 
            ... etc
) 
AS value(v)
) 
as [Max Weight]
FROM workoutsessions ws
join ExerciseCultures ec on ws.ExerciseID = ec.ExerciseID
where ec.Name = 'Bench Press'

这样，WeightRepsx值将被忽略，如果＆＃39;邻近＆＃39}。根据您的要求，Repsx值不大于特定值。

当然这是相当丑陋的，但它是一个选项，因为你的表没有正确规范化。

返回多列和相邻列中的最大值

2 个答案: