如何将sql server中的逗号分隔字符串拆分为n列答案

【问题标题】：how to split comma separated string in sql server into n-number of columns如何将sql server中的逗号分隔字符串拆分为n列
【发布时间】：2018-05-04 12:01:22
【问题描述】：

我有一个表 tb1，其中有一列 OppName 为：（8-values in 一行 csv)

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

我正在尝试将每个逗号分隔的值拆分为单独的列为：

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

我所做的是：

第 1 步： 从字符串中删除 [] 为：

   UPDATE tb1 
   SET [OppName] = REPLACE(REPLACE([OppName], '[', ''), ']', '')

# output: "OpportunityName","Fact","","","StartDate","EndDate","IsActive","UpdateDate"

第 2 步： 在 vars 中拆分字符串并将所有 vars 插入到 tb2 中的每一行：

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)

但字符串连接不正确

有人可以帮我吗

【问题讨论】：

看看stackoverflow.com/questions/50063415/…
您是否检查过您的字符串中是否有逗号？例如“事实，事实2，事实3”？这会打破你的分裂方法。此外：您如何处理这些记录？是通过 SSIS 之类的 ETL 吗？在这种情况下，我建议使用 C# Split 函数。

标签： sql-server string split

【解决方案1】：

SQL 2016 具有函数 STRING_SPLIT。结合 PIVOT，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;

【讨论】：