SQL Server 2005：將字符串拆分爲數組並獲取數組（x）？

Question

我有一個數據庫表中的字符串是這樣的：

Peter/Parker/Spiderman/Marvel 
Bruce/Wayne/Batman/DC 

是否有SQL的方式例如從字符串中提取特定的值

Name = MyColumn(0) 
SurName = MyColumn(1) 
Character = MyColumn(3) 
Company = MyColumn(4) 

感謝

Answer 1

如果你知道你將會有確切的4列，那麼你也可以使用這個嵌套的CTE版本：

;with s1 (name, extra) as 
(
    select left(data, charindex('/', data)-1), 
    substring(data, charindex('/', data) +1, len(data)) 
    from yourtable 
), 
s2 (name, surname, extra) as 
(
    select name, 
    left(extra, charindex('/', extra)-1), 
    substring(extra, charindex('/', extra)+1, len(extra)) 
    from s1 
), 
s3 (name, surname, [character], company) as 
(
    select name, 
    surname, 
    left(extra, charindex('/', extra)-1), 
    substring(extra, charindex('/', extra)+1, len(extra)) 
    from s2 
) 
select * 
from s3; 

見SQL Fiddle with Demo

結果是：

| NAME | SURNAME | CHARACTER | COMPANY | 
----------------------------------------- 
| Peter | Parker | Spiderman | Marvel | 
| Bruce | Wayne | Batman |  DC | 

或者你可以實現分割數據的CTE，然後執行一個PIVOT：

;with cte (item, data, colNum, rn) as 
(
    select cast(left(data, charindex('/',data+'/')-1) as varchar(50)) item, 
    stuff(data, 1, charindex('/',data+'/'), '') data, 
    1 colNum, 
    row_number() over(order by data) rn 
    from yourtable 
    union all 
    select cast(left(data, charindex('/',data+'/')-1) as varchar(50)) , 
    stuff(data, 1, charindex('/',data+'/'), '') data, 
    colNum+1, 
    rn 
    from cte 
    where data > '' 
) 
select [1] as Name, 
    [2] as Surname, 
    [3] as [character], 
    [4] as company 
from 
(
    select item, colnum, rn 
    from cte 
) src 
pivot 
(
    max(item) 
    for colnum in ([1], [2], [3], [4]) 
) piv 

請參閱SQL Fiddle with Demo

Answer 2

我在這裏假設有總是精確4個部分組成。

如果是這樣，您可以用.代替/並使用ParseName函數中的nice函數。從你的例子唯一的問題是，它從最終統計，所以你必須要小心你想要的部分：

DECLARE @test VARCHAR(max); 
SET @test = 'Peter/Parker/Spiderman/Marvel'; 
SET @test = Replace(@test, '/', '.'); 

SELECT Parsename(@test, 4),--returns Peter 
     Parsename(@test, 3),--returns Parker 
     Parsename(@test, 2),--returns Spiderman 
     Parsename(@test, 1) --returns Marvel 

如果有部件數量可變的，你需要找到一個字符串分割功能爲你做這個，沒有一個好的內置。許多選項可以發現搜索SO：https://stackoverflow.com/search?q=[sql+server]+string+split

Word的警告 - 如果您嘗試使用一個數字與PARSENAME非1- 4，結果將始終爲NULL。