Question

我在SQL Server Management Studio中有一个表，其中包含数字范围的列作为字符串。我试图找到一种方法从字符串中提取数值并将它们插入到新表中。

例如，在表格中，我将值12.45% - 42.32%作为字符串。我希望能够获得12.45和42.32并将其插入到包含min_percent和max_percent列的新表格中。

我找到了几种使用SQL从字符串中提取单个数值的方法，并尝试从Extract numbers from a text in SQL Server修改函数（它返回多个整数，但不是小数），但到目前为止我还没有能够使它工作。提前感谢任何建议

Answer 1

功能非常接近。您只需使用数字并添加点：

  with C as
  (
    select cast(substring(S.Value, S1.Pos, S2.L) as decimal(16,2)) as Number,
           stuff(s.Value, 1, S1.Pos + S2.L, '') as Value
    from (select @String+' ') as S(Value)
      cross apply (select patindex('%[0-9,.]%', S.Value)) as S1(Pos)
      cross apply (select patindex('%[^0-9,.]%', stuff(S.Value, 1, S1.Pos, ''))) as S2(L)
    union all
    select cast(substring(S.Value, S1.Pos, S2.L) as decimal(16,2)),
           stuff(S.Value, 1, S1.Pos + S2.L, '')
    from C as S
      cross apply (select patindex('%[0-9,.]%', S.Value)) as S1(Pos)
      cross apply (select patindex('%[^0-9,.]%', stuff(S.Value, 1, S1.Pos, ''))) as S2(L)
    where patindex('%[0-9,.]%', S.Value) > 0
  )
  select Number
  from C

Answer 2

这是一种使用SQL Server中可用的字符串操作的强力方法：

with t as (
      select '12.45% - 42.32%'  as val
     )
select cast(SUBSTRING(val, 1, charindex('%', val) - 1) as float) as minval,
       cast(replace(substring(val, len(val) - charindex(' ', reverse(val))+2, 100), '%', '') as float) as maxval
from t

Answer 3

假设您的数据一致，这应该可以正常工作，并且具有更容易在眼睛上看到的额外优势。如果你想要精确的话，还要考虑十进制。

select
  cast(left(r, charindex('%', r) - 1) AS float) as minVal,
  cast(replace(right(r, charindex('-', r) - 1), '%', '') as float) AS maxVal
from ( select '22.45% - 42.32%' as r ) as tableStub

从T-SQL中的字符串中提取多个十进制数

3 个答案: