更好的 SQL 查询以根据模式拆分字母数字字符串

Question

我需要拆分字母数字字符串，例如“20A30D40I10O”，如下所示。允许出现的字符：A,D,I,O任意顺序及其对应的百分比。

+------+------+
|可乐 |科尔B |
+------+------+
| 20 |一个|
| 30 | D |
| 40 |我 |
| 10 |欧 |
+------+------+

我曾尝试编写相同的查询。

声明@Val Varchar(100)
设置@Val = '20A30D40I10O'

声明 @origTable TABLE(名称 VARCHAR(1000))
插入@origTable(名称)值(@Val)

    SELECT SUBSTRING(name,1,2),SUBSTRING(name,3,1)FROM @origTable where name LIKE '%[0-9][0-9]%' and (SUBSTRING(name,3, 1) LIKE 'A' OR SUBSTRING(name,3,1) LIKE 'D' OR SUBSTRING(name,3,1) LIKE 'I' OR SUBSTRING(name,3,1) LIKE 'O')
    联合所有
    SELECT SUBSTRING(name,4,2),SUBSTRING(name,6,1) FROM @origTable where name LIKE '%[0-9][0-9]%' and (SUBSTRING(name,6, 1) LIKE 'A' OR SUBSTRING(name,6,1) LIKE 'D' OR SUBSTRING(name,6,1) LIKE 'I' OR SUBSTRING(name,6,1) LIKE 'O')
    联合所有
    SELECT SUBSTRING(name,7,2),SUBSTRING(name,9,1) FROM @origTable where name LIKE '%[0-9][0-9]%' and (SUBSTRING(name,9, 1) LIKE 'A' OR SUBSTRING(name,9,1) LIKE 'D' OR SUBSTRING(name,9,1) LIKE 'I' OR SUBSTRING(name,9,1) LIKE 'O')
    联合所有
    SELECT SUBSTRING(name,10,2),SUBSTRING(name,12,1) FROM @origTable where name LIKE '%[0-9][0-9]%' and (SUBSTRING(name,12, 1) LIKE 'A' OR SUBSTRING(name,12,1) LIKE 'D'OR SUBSTRING(name,12,1) LIKE 'I' OR SUBSTRING(name,12,1) LIKE 'O')

但是如果字符串包含 1 位百分比，则此查询不足以拆分字符串。例如：'98D2O'

Answer 1

使用 while 循环和一些 string 函数。可能不是最好的方法，但应该有效。试试这个。

DECLARE @Val  VARCHAR(100),@cnt  INT =1,@temp VARCHAR(50),@len  INT,@intr INT=1

SET @Val = '20A30D40I10O'
SET @len = Len(@Val)

DECLARE @origTable TABLE
  (name VARCHAR(1000))

WHILE @cnt <= @len
  BEGIN
      SET @temp =Substring(@Val, @cnt, 1)
      IF @temp LIKE '[a-z]'
        BEGIN
            INSERT INTO @origTable
            SELECT Substring(@Val, @intr, ( @cnt - @intr ) + 1)

            SET @intr = @cnt + 1
        END
      SET @cnt=@cnt + 1
  END

SELECT LEFT(name, Patindex('%[a-z]%', name) - 1) Cola,
       Substring(name, Patindex('%[a-z]%', name), Len(name)) Colb
FROM   @origTable

Answer 2

我解决了这个问题。但我知道的已经晚了。我只想分享我所做的想法。

CREATE TABLE #Temp(ColA INT, ColB VARCHAR(20))

DECLARE @TempString VARCHAR(100)
SET @TempString = '20A30D40I10O'
DECLARE @TempVAL VARCHAR(10)
DECLARE @Position INT
DECLARE @Col1Val VARCHAR(10)
SET @Position = 1

WHILE (@Position <= LEN(@TempString))
BEGIN
  SET @TempVAL = SUBSTRING(@TempString, @Position, 1)

  IF(ISNUMERIC(@TempVAL) = 1)
     SET @Col1Val = ISNULL(@Col1Val, '') + @TempVAL
  ELSE
  BEGIN
     INSERT INTO #Temp VALUES(@Col1Val, @TempVAL) 

     SET @Col1Val = NULL
  END
  SET @Position = @Position + 1

END

SELECT * FROM #Temp

更好的 SQL 查询以根据模式拆分字母数字字符串

Better SQL Query to split alphanumeric string based on pattern

sql

sql-server

sql-server-2008