SQL - 訂單由特定符號

Question

後，我在這個形式的字符串的select語句的結果：

"123400000000020~forename~surname~P50206.00011" 
"123400000111111~forname1~surname1~P50206.00011" 
.... 

我怎麼可以在SQL姓氏排序？他們是否有可能在第二個「〜」中切斷琴絃？

Answer 1

CHARINDEX是你的朋友在這裏。您將需要將其嵌套在自身內部，並運行兩次，因爲您需要第二個實例。

DECLARE @SearchString nvarchar(max) 
SET @SearchString = '123400000111111~forname1~surname1~P50206.00011' 

DECLARE @Delimiter nvarchar(1) 
SET @Delimiter = '~' 

/* 
SELECT @SearchString AS [Your String] 
--the string puked back 

SELECT 
    RIGHT 
     (
     @SearchString, 
     LEN(@SearchString) - charindex(@Delimiter, @SearchString) 
     ) AS [The First Instance] 
--first instance of @Delimiter 
*/ 

SELECT 
    RIGHT 
    (
     RIGHT 
      (
      @SearchString, 
      LEN(@SearchString) - CHARINDEX(@Delimiter, @SearchString) 
      ), 
      LEN 
      (
       RIGHT(@SearchString, LEN(@SearchString) - CHARINDEX(@Delimiter, @SearchString)) 
      ) - 
      CHARINDEX 
      (
       @Delimiter, RIGHT(@SearchString, LEN(@SearchString) - CHARINDEX(@Delimiter, @SearchString)) 
      ) 
    ) AS [Your Awful Order By] 
--what you're after 

但對於所有的愛在數據庫的世界，以及你自己的理智的緣故神聖的，更何況性能，不存儲這樣的數據！

Answer 2

我認爲這會對你有所幫助;

select substr(somedata, regexp_instr(somedata, '(~)', 1, 2, 1) , regexp_instr(substr(somedata, regexp_instr(somedata, '(~)', 1, 2, 1)),  '(~)', 1, 1, 1)-2) as surname from (
select '123400000000020~forename~surname~P50206.00011' as somedata from dual 
    union 
    select '123400000111111~forname1~surname1~P50206.00011' as somedata from dual 
union 
select '123400000000020~forename~surname3~' as somedata from dual 
union 
select '3~~surname5~P50206.00011' as somedata from dual 
) 
order by 1 asc