SQL 查找字符串中的第一个非数字字符

2021-12-13 00:00:00 string parsing tsql sql-server

我继承了一个带有 [nonnumericprefix][number] 格式标识符的表格.例如(ABC123;R2D2456778;等等).我想知道是否有一种很好的方法可以将 SQL 中的它分成两个字段,从右侧形成的最大整数和前缀,例如 (ABC, 123; R2D, 2456778; etc).我知道我可以使用游标、C# 代码等来做到这一点——如果必须的话,我会这样做——但我不会经常遇到我在 SQL 中无法快速轻松地完成的事情,所以我想我会发布它在这里.

I inherited a table with identifiers in a format [nonnumericprefix][number]. For example (ABC123; R2D2456778; etc). I was wondering if there was a good way to split this in SQL into two fields, the largest integer formed from the right side, and the prefix, for example (ABC, 123; R2D, 2456778; etc). I know I can do this with a cursor, C# code, etc - and I will if I have to - but I don't run into things I cannot do fast and easily in SQL very often, so I thought I'd post it here.

推荐答案

  1. 反转字符串
  2. 使用 PATINDEX 查找第一次出现的非数字字段
  3. 使用 LEFT 函数返回字符串的数字部分

代码示例

DECLARE @myString varchar(100);
DECLARE @largestInt int;

SET @myString = 'R2D2456778'

SET @mystring = REVERSE(@myString);
SET @largestInt = LEFT(@myString, PATINDEX('%[a-z]%', @myString) - 1)

PRINT ( CONVERT(varchar(100), @largestInt) )

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