mysql 合并多条记录中的列 为一条记录中的多列

[yuloukong]

code name phone
aa 张三 132000000
aa 李四 133000000
bb 王五 122000000
bb 照六 144000000
bb 无七 155000000

结果：

code name1 phone1 name2 phone2
aa 张三 132000000 李四 133000000
bb 王五 122000000 照六 144000000

code 相同的可能有多个 但只取前2个

[WaterGG]

--> 测试数据: #tb
if object_id('tempdb.dbo.#tb') is not null drop table #tb
go
create table #tb (code varchar(2),name varchar(4),phone int)
insert into #tb
select 'aa','张三',132000000 union all
select 'aa','李四',133000000 union all
select 'bb','王五',122000000 union all
select 'bb','照六',144000000 union all
select 'bb','无七',155000000

alter table #tb add id int identity(1,1)

select *,n=(select count(*) from #tb where code=t.code and id<=t.id)
into #t
from #tb t

select code,
	name1=max(case when n=1 then name end),
	phone1=max(case when n=1 then phone end),
	name2=max(case when n=2 then name end),	
	phone2=max(case when n=2 then phone end) 
from #t  
group by code 


code name1 phone1      name2 phone2
---- ----- ----------- ----- -----------
aa   张三    132000000   李四    133000000
bb   王五    122000000   照六    144000000
警告: 聚合或其他 SET 操作消除了空值。

(2 行受影响)

[飘零一叶]

IF OBJECT_ID('TB') IS NOT NULL DROP TABLE TB
GO
CREATE TABLE TB
(
   CODE VARCHAR(5),
   NAME NVARCHAR(25),
   PHONE VARCHAR(20)
)
INSERT INTO TB
SELECT 'aa','张三','132000000' UNION ALL
SELECT 'aa','李四','133000000' UNION ALL
SELECT 'bb','王五','122000000' UNION ALL
SELECT 'bb','照六','144000000' UNION ALL
SELECT 'bb','无七','155000000'

;WITH CTE AS
(
  SELECT ROW_NUMBER() OVER(PARTITION BY CODE ORDER BY CODE) AS RN,NAME,PHONE,CODE FROM TB
)
SELECT C1.CODE,C1.NAME,C1.PHONE,C2.NAME,C2.PHONE FROM CTE C1 JOIN CTE C2 ON C1.RN+1=C2.RN AND C1.CODE=C2.CODE 
WHERE C2.RN=2
---------------------------------
CODE	NAME	PHONE	NAME	PHONE
aa	张三	132000000	李四	133000000
bb	王五	122000000	照六	144000000

[pt1314917]

--> 测试数据: [tb]
if object_id('[tb]') is not null drop table [tb]
create table [tb] (code varchar(2),name varchar(4),phone int)
insert into [tb]
select 'aa','张三',132000000 union all
select 'aa','李四',133000000 union all
select 'bb','王五',122000000 union all
select 'bb','照六',144000000 union all
select 'bb','无七',155000000

select code,
name1=MAX(case xh when 1 then name else null end),
phone1=MAX(case xh when 1 then phone else null end),
name2=MAX(case xh when 2 then name else null end),
phone2=MAX(case xh when 2 then phone else null end)
from
(select xh=ROW_NUMBER() over(partition by code order by name),* from [tb])a
group by code


code name1 phone1      name2 phone2
---- ----- ----------- ----- -----------
aa   李四    133000000   张三    132000000
bb   王五    122000000   无七    155000000

[joyhen]

--> 测试数据: [tb]
if object_id('[tb]') is not null drop table [tb]
create table [tb] (code varchar(2),name varchar(4),phone int)
insert into [tb]
select 'aa','张三',132000000 union all
select 'aa','李四',133000000 union all
select 'bb','王五',122000000 union all
select 'bb','照六',144000000 union all
select 'bb','无七',155000000

--①表信息
SELECT * FROM tb

--②处理
SELECT code,MAX(phone) AS phone FROM TB GROUP BY code
--结果：
--code phone
------ -----------
--aa   133000000
--bb   155000000

--(2 行受影响)

--③删除表
DROP TABLE tb

[joyhen]

擦，看错了

[joyhen]

--> 测试数据: [tb]
if object_id('[tb]') is not null drop table [tb]
create table [tb] (code varchar(2),name varchar(4),phone int)
insert into [tb]
select 'aa','张三',132000000 union all
select 'aa','李四',133000000 union all
select 'bb','王五',122000000 union all
select 'bb','照六',144000000 union all
select 'bb','无七',155000000

--①表信息
SELECT * FROM tb

--②处理
SELECT * FROM TB

;with newtb as(
	select *, ROW_NUMBER() over(partition by code order by phone asc) as num from [tb] as a
)
select code,[name] ,phone from newtb where newtb.num =1 or newtb.num=2
--结果：
--code name phone
------ ---- -----------
--aa   张三   132000000
--aa   李四   133000000
--bb   王五   122000000
--bb   照六   144000000
--
--(4 行受影响)

--③删除表
DROP TABLE tb

[dawugui]

mysql?帮顶了.

[搬砖的煮夫]

如果我要全部显示呢？不止只是显示2个呢？有多少就显示多少，怎么弄？