‘壹’ sql两列合并
试试看！
select cast(sid as varchar(max))+':'+cast(AllotSID as varchar(max)) as bane from PAS_AllotRatio
‘贰’ sql 两列合并成一列的问题
-- a b 类型为varchar
declare @t1 table(a varchar(10),b varchar(10))
insert into @t1
select '1','1' union
select '2','2' union
select '3','3'
select a+b c from @t1
--a b类型为int
declare @t2 table(a int,b int)
insert into @t2
select 1,1 union
select 2,2 union
select 3,3
select cast(a as varchar)+cast(b as varchar) c from @t2
--结果如下：
(3 个资料列受到影响)
c
--------------------
11
22
33
(3 个资料列受到影响)
(3 个资料列受到影响)
c
------------------------------------------------------------
11
22
33
(3 个资料列受到影响)
‘叁’ SQL 将两列的数据合并在一列
selectxxaszzfrom表unionallselectyyfrom表;
‘肆’ sql,把两个表中的两列数据合到一个表中
两个表的数据量一样的吗？
合并后创建新表吗？
需要借助辅助列
select
identity(int,1,1)
as
guid
,val
into
#1
from
table1
select
identity(int,1,1)
as
guid
,val
into
#2
from
table2
select
a.val
as
val1,b.val
as
val2
into
table3
from
#1
a
inner
join
#2
b
on
a.guid
=
b.guid
‘伍’ SQL 两列合并的问题
改为
select isnull(convert(varchar(30),A.a,120),'')+isnull(convert(varchar(30),B.b,120)AS time,'')
‘陆’ SQL怎样合并表中两列的值为一列来显示
select concat(name,id) as nameid,age
from example
具体可以参考：网页链接