SQL Server一个字符串拆分多行显示或者多行数据合并成一个字符串

declare  @table1  table (    id int ,code varchar(10) , name varchar(20) );
 
insert into @table1 ( id,code, name ) values ( 1, 'm1','a' ), ( 2,  'm2',null ), ( 3, 'm3', 'c' ), ( 4,  'm2','d' ), ( 5,  'm1','c' );

select * from @table1;

select name, files=stuff((select ','+convert(varchar, code)
                          from @table1 b
                          where a.name=b.name
                         for xml path('')), 1, 1, '')
from @table1 a
group by name;

SELECT  name,   string_agg(code,';') files FROM @table1 GROUP BY name;

declare @moulds varchar(4000);
set @moulds='55-480730-03,
55-487780-01,
,
 55-487780-02 ';
declare @table1 table(col1 nvarchar(4000));
declare @table2 table(col1 nvarchar(40),xmlval1 xml);
insert into @table1 values(replace(@moulds, char(13)+char(10), ''));
select * from @table1

insert into @table2  
select   rtrim(ltrim(replace(bs.v1, char(9), '') )),a.xmlval1
from (select convert(xml, '<n>'+replace(replace(col1, '，', ','), ',', '</n><n>')+'</n>') as xmlval1  
       from @table1) a
       cross apply(select k.n.value('.', 'nvarchar(80)') v1 from a.xmlval1.nodes('n') k(n) ) bs
where bs.v1 !='';

select * from @table2;

declare @moulds varchar(4000);
set @moulds='55-480730-03,
55-487780-01,
,
 55-487780-02 ';
declare @table1 table(col1 nvarchar(4000));
declare @table2 table(col1 nvarchar(40), pos int);
insert into @table1 values(replace(@moulds, char(13)+char(10), ''));
select * from @table1;

insert into @table2
select rtrim(ltrim(replace(substring(A.col1, B.number, charindex(',', A.col1+',', B.number)-B.number) , char(9), '') )) as col2, B.number
from @table1 A
     inner join master..spt_values B
         on charindex(',', ','+A.col1, B.number)=B.number
where B.type='P';

select * from @table2;

declare @table1 table
    (
        ID int ,
        Col1 nvarchar(50) ,
        Col2 nvarchar(50)
    );

insert into @table1 values ( 1, 'a,b,c', '诶，必，塞，地，伊' );
insert into @table1 values ( 2, 'w', N'三四，不知道咧' );


--方式一
select a.ID, a.Col1, a.Col2,  v1, v2
from   (   select ID, Col1, Col2, convert(xml, '<n>' + replace(replace(Col1, '，', ','), ',', '</n><n>') + '</n>') as xmlval1 ,
                                  convert(xml, '<n>' + replace(replace(Col2, '，', ','), ',', '</n><n>') + '</n>') as xmlval2
           from   @table1 ) a
       cross apply (   select k.n.value('.', 'nvarchar(80)') v1
                       from   a.xmlval1.nodes('n') k(n) ) bs
       cross apply (   select k.n.value('.', 'nvarchar(80)') v2
                       from   a.xmlval2.nodes('n') k(n) ) ns;

--方式二
select ID, t.Col1,t.Col2,  v1, v2
from   @table1 as t
       cross apply ( values (convert(xml, '<n>' + replace(replace(Col1, '，', ','), ',', '</n><n>')+ '</n>'), 
                             convert(xml, '<n>' + replace(replace(Col2, '，', ','), ',', '</n><n>')+ '</n>'))
                   ) a (xmlval1 , xmlval2 )
       cross apply (   select k.n.value('.', 'varchar(80)') as v1
                       from   a.xmlval1.nodes('n') k(n)) bs
       cross apply (   select k.n.value('.', 'varchar(80)') as v2
                       from   a.xmlval2.nodes('n') k(n) ) ns;

--1. 创建fn_Split函数
IF EXISTS(
       SELECT *
       FROM   dbo.sysobjects
       WHERE  id = OBJECT_ID('fn_Split')
              AND (TYPE = 'FN' OR TYPE = 'TF' OR TYPE = 'IF')
   )
    DROP FUNCTION fn_Split  
GO  
   
CREATE FUNCTION [dbo].[fn_Split]
(
    @str           VARCHAR(MAX),
    @separator     VARCHAR(10)
)
RETURNS TABLE
AS
    RETURN 
    (
        
        SELECT B.id
        FROM   (
                   (
                          --A　的作用只是生成 '<v>a</v><v>b</v><v>d</v><v>c</v>' 的XML格式的数据, 提供数据源 
                       SELECT [value] = CONVERT(XML, '<v>' + REPLACE(@str, @separator, '</v><v>') + '</v>')
                   ) A 
                   OUTER APPLY
                   (
                          --B 的作用是将A中的 XML 数据的值枚举出来转换成行
                       SELECT id = N.v.value('.', 'varchar(100)') FROM   A.[value].nodes('/v') N(v)
                   ) B
               )
    )
GO

declare @moulds varchar(4000);
set @moulds='55-480730-03,
55-487780-01,
,
 55-487780-02 ';
declare @table1 table(id INT,col1 nvarchar(MAX));

INSERT INTO @table1 VALUES(1,replace(@moulds, char(13)+char(10), ''))
INSERT INTO @table1 VALUES(2,replace(@moulds, char(13)+char(10), ''))
select * from @table1;

SELECT a.id,rtrim(ltrim(replace(b.id, char(10), '') )) AS item 
FROM @table1 a CROSS APPLY dbo.fn_Split(a.col1,',') AS b
where b.id !=''

SELECT t.id,
       t.name,
       t.description,
       v.value
FROM test t
    CROSS APPLY STRING_SPLIT(t.description, ',')v;