Question

我的表格值为

FKTABLE_NAME               FKCOLUMN_NAME               PKCOLUMN_NAME
table1                     column1                        column1
table1                     column2                        column2
table2                     column1                        column1
table2                     column2                        column2

我需要如何将其转换为

FKTABLE_NAME               FKCOLUMN_NAME               PKCOLUMN_NAME

tablel1                    column1,column2                column1,column2
table12                    column1,column2                column1,column2

基本上，我试图通过表名来获取逗号分隔列组。

感谢

Answer 1

这是任何db

的工作查询

select distinct table_name,
  stuff((select ','+data_type
   from information_schema.columns b
   where b.table_name=a.table_name
   for xml path(''),type).value('.[1]','nvarchar(max)'),1,1,'') AS data_types,
  stuff((select ','+column_name
   from information_schema.columns b
   where b.table_name=a.table_name
   for xml path(''),type).value('.[1]','nvarchar(max)'),1,1,'') AS column_names
from information_schema.columns a

这是您的查询

select distinct FKTABLE_NAME,
  stuff((select ','+FKCOLUMN_NAME
   from tbl b
   where b.FKTABLE_NAME=a.FKTABLE_NAME
   for xml path(''),type).value('.[1]','nvarchar(max)'),1,1,'') AS FKCOLUMN_NAMES,
  stuff((select ','+PKCOLUMN_NAME
   from tbl b
   where b.FKTABLE_NAME=a.FKTABLE_NAME
   for xml path(''),type).value('.[1]','nvarchar(max)'),1,1,'') AS PKCOLUMN_NAMES
from tbl a

Answer 2

SELECT [Col1Name] + ',' + [Col2Name] + ',' ... + [ColNName]
FROM [tableName]

Answer 3

与所有字符串聚合问题一样，我建议编写一个自定义聚合（我强烈建议使用clr聚合以获得最佳性能）并编写一个这样的查询

select fktablename, stringAggregate(fkcolumnname), stringAggregate(pkcolumnname)
group by 
fktablename

some tips here

other nice reading

Answer 4

下面的SQL语句用于转换单行中的单列数据：

declare @testdata varchar(8000)
set @testdata=''

select @testdata=@testdata+NAME+', ' from User where ID in('1','2','3','4','5')
print @testdata

select substring(@testdata,0,len(@testdata))

在上面的例子中：

用户是一张桌子
NAME是用户的栏，其中数据将是行中的manuplate
ID是用户列

供参考，请参阅以下链接：

http://www.thedevheaven.com/2012/02/column-data-in-to-single-row-with-comma.html

如何将列值转换为逗号分隔的行值

4 个答案: