如何将sql server中逗号分隔的字符串拆分为n个列

Question

1. 我有一个表 tb1 ，其中一列 OppName 为:( 8位值在 一行csv）

   ["OpportunityName","Fact","","","StartDate","EndDate","IsActive","UpdateDate"]
   

   我正在尝试将每个逗号分隔值拆分为单独的值 专栏：

         c1              c2      c3 c4 c5 c6 c7          c8
   "OpportunityName"   "Fact"    .........            "UpdateDate"
   

   我做的是：

   第1步：将字符串中的[]删除为：

      UPDATE tb1 
      SET [OppName] = REPLACE(REPLACE([OppName], '[', ''), ']', '')
   
   # output: "OpportunityName","Fact","","","StartDate","EndDate","IsActive","UpdateDate"
   

   第2步：在vars中拆分字符串，并为每一行将所有变量插入到tb2中：

   DECLARE @list varchar(8000)
   DECLARE @pos INT
   DECLARE @len INT
   DECLARE @value varchar(8000)
   DECLARE @x nvarchar(max)
   
   SET @list = '"OpportunityName","Fact","","","StartDate","EndDate","IsActive","UpdateDate",'
   
   set @pos = 0
   set @len = 0
   
   WHILE CHARINDEX(',', @list, @pos+1)>0
   BEGIN
       set @len = CHARINDEX(',', @list, @pos+1) - @pos
       set @value = SUBSTRING(@list, @pos, @len)
       set @value = REPLACE (@value, '"', '')       
       PRINT @value -- for debug porpose  
       set @pos = CHARINDEX(',', @list, @pos+@len) +1
       --Append values to x
       set @x =  (@x  +','+ @value) 
   END
   
     PRINT @x
      --Inserting in tb2
     Insert into  tb2 values(@x)
   

   但字符串没有正确连接

   有人可以帮我吗

Answer 1

SQL 2016具有STRING_SPLIT功能。与PIVOT结合使用，您可以执行以下操作：

;WITH CTE AS (
    SELECT value, ColumnName = 'c' + CAST(ROW_NUMBER() OVER(ORDER BY (SELECT NULL)) AS VARCHAR)
    FROM STRING_SPLIT('"OpportunityName","Fact","","","StartDate","EndDate","IsActive","UpdateDate"',',')
)
SELECT * 
FROM CTE
pivot (MAX(value) FOR ColumnName IN("c1","c2","c3","c4","c5","c6","c7","c8")) AS p;