协助改善电话号码扩展解析查询

Question

我有一个似乎有效的SQL查询，但是它使我感到不必要的冗长（有益于理解，但可能不利于速度）。我希望有人可以将其编码为更多功能。

DECLARE @temp TABLE
(
      strng varchar(5000)
)

INSERT INTO @temp (strng)
VALUES 
    ('555-444-6285'),
    ('intercom 5362'),
    ('555-444-6285 ext. 5362'),
    ('(306) 250-4968'),
    ('011-555-888 9965-6859'),
    ('Not a Phone Number')

SELECT LeftNumeric
        , CASE WHEN PosOfNum > 1 THEN LEFT(RightRemainder, PosOfNum-1) ELSE RightRemainder END AS MiddleAlpha
        , CASE WHEN PosOfNum > 1 THEN RIGHT(RightRemainder, LEN(RightRemainder)-PosOfNum+1) ELSE '' END AS RightNumeric
FROM
(
SELECT strng
        , LeftNumeric
        , RightRemainder
        , PATINDEX('%[-0-9()]%', RightRemainder) as PosOfNum
FROM
(
SELECT strng 
        ,PosOfChar
        , CASE WHEN PosOfChar > 0 THEN LEFT(strng, PosOfChar-1) ELSE Strng END AS LeftNumeric
        , CASE WHEN PosOfChar > 0 THEN RIGHT(strng, LEN(strng)-PosOfChar+1) ELSE '' END AS RightRemainder
FROM
(
SELECT strng
        , PATINDEX('%[^-0-9.() ]%', strng) as PosOfChar
    FROM @Temp
) Process1
) Process2
) Process3

运行以上命令的最终结果如下：

LeftNumeric             MiddleAlpha         RightNumeric
555-444-6285        
                        intercom            5362
555-444-6285            ext.                5362
(306) 250-4968      
011-555-888 9965-6859       
                        Not a Phone Number  

Answer 1

这是我们采用的最终解决方案，效果很好。