Question

我有以下情况：我有2列，第一列称为AgentID，第二列在代理表中称为AgentName。很少有AgentID以＆＃34; A＆＃34;很少开始使用＆＃34; M＆＃34;，我想要做的是以下内容：

AgentID AgentName
A123    Name1
M123    Name2
A234    Name3

Aagents AAgentName Magents MAgentName
A123    Name1      M123    Name2
A234    Name3      NULL    NULL

这可能吗？我知道这很奇怪，但我的老板希望这样做！

Answer 1

您可以在2个子查询之间进行完全外部联接（一个用于A代理，一个用于M个代理），并且在ROW_NUMBER()上加入以在一侧具有空值（具有较少记录的那个）：

select A.AgentID Aagents, A.AgentName AAgentName, M.AgentID Magents, M.AgentName MAgentName from
(select *, ROW_NUMBER() over (order by AgentID) rn from Agents where AgentID like 'A%') A
full outer join
(select *, ROW_NUMBER() over (order by AgentID) rn from Agents where AgentID like 'M%') M
on A.rn = M.rn

Answer 2

试试这个

WITH AAgents AS
(
  SELECT ROW_NUMBER() over (order by AgentID) AS RN,
         AgentID AS Aagents,
         AgentName As AAgentName
  FROM Agents
  WHERE LEFT(AgentID,1)='A'
),
MAgents As
(
  SELECT ROW_NUMBER() over (order by AgentID) AS RN,
         AgentID AS Magents,
         AgentName As MAgentName
  FROM Agents
  WHERE LEFT(AgentID,1)='M'
)

SELECT
  Aagents,
  AAgentName,
  Magents,
  MAgentName
FROM AAgents
FULL OUTER JOIN MAgents
ON AAgents.RN=MAgents.RN

SQL FIDDLE DEMO

Answer 3

尝试这个

select * from (select AgentID as Aagents, AgentName as AagentName from table where 
AgentID like 'A%'), (select AgentID as MAgents, AgentName as MAgentName from 
table where AgentID like 'M%')

Answer 4

类似的东西：

select 
case when AgentName like 'A%' then name end as Aagents,
case when AgentName like 'M%' then Name end as Magents
from tblName

查询将列分为多个列

4 个答案: