Question

有一个存储客户名称的表，我需要复制这些记录并在同一时间添加一个字符。例如

我有：

CNAME
customer1
customer2
customer3

我想回复：

CNAME
customer1
customer1*
customer1#
customer2
customer2*
customer2#
customer3
customer3*
customer3#

有人可以帮帮我吗？感谢

Answer 1

<强> SQL2008 +

DECLARE @Customer TABLE (CNAME NVARCHAR(50) NOT NULL);
INSERT  @Customer (CNAME)
VALUES  ('customer1'), ('customer2'), ('customer3');

SELECT  c.CNAME + x.SuffixChar AS NewCNAME
FROM    @Customer c 
CROSS JOIN (VALUES (''), ('*'), ('#')) x(SuffixChar);

NewCNAME
----------
customer1
customer1*
customer1#
customer2
customer2*
customer2#
customer3
customer3*
customer3#

Answer 2

您可以将结果合并在一起：

select
  cname
from
  table1
union all
select
  cname + '*'
from
  table1 
union all
select
  cname + '#'
from
  table1 
order by cname

您可以在this fiddle

中看到它正常工作

Answer 3

我会使用数字表和此查询：

with c as
(
    select c.*, rn=row_number()over(order by cname)
    from customers c
)
select cname = cname + case n % 3
                when 1 then ''
                when 2 then '*'
                when 0 then '#' END
from numbers n join c
on n between 1 and 3
order by rn

结果：

customer1
customer1*
customer1#
customer2
customer2*
customer2#
customer3
customer3*
customer3#

如何创建数字表：http://sqlperformance.com/2013/01/t-sql-queries/generate-a-set-1

Answer 4

连接字符串，例如：

select u.login || ' ' || u.password from user u

输出：用户1234

编辑：你的问题更复杂。我认为这只是为了连接字符串。

如何在sql中复制和添加更多字符到字符串行？

4 个答案: