高级SQL选择以使用不同的标题名称获取相同的列值

Question

我正在尝试从表T1创建一个select查询，该表有四列，如下所示

• FILE_NAME
• agnt_name
• agnt_lot_num
• agnt_serial_num

我的目标是获得一个选择输出表，其列名为synoynym，如下所示

File_name，'UDAV'，'Hemat'，'CCI'

我遇到的挑战是：

UDAV - SELECT agnt_serial_num FROM T1 WHERE agnt_name ='UV inhibitor'
Hemat - SELECT agnt_serial_num FROM T1 WHERE agnt_name ='hematoxylin'
CCI - SELECT concat(agnt_serial_num,'_',agnt_lot_num) FROM T1 WHERE agnt_name ='Carbon Morpher'

这些'agnt_name（s）'中的每一个对于file_name都是唯一的。任何帮助将不胜感激

Answer 1

是否有What you looking for?

也许我想念你的需求

Answer 2

我猜：

select a.file_name
, a.sn as 'UDAV'
, b.sn as 'Hemat'
, c.sn as 'CCI'
from 
( SELECT agnt_serial_num sn FROM T1 WHERE agnt_name ='UV inhibitor' ) a
,( SELECT agnt_serial_num sn FROM T1 WHERE agnt_name ='hematoxylin' )b
,( SELECT concat(agnt_serial_num,'_',agnt_lot_num) sn FROM T1 WHERE agnt_name ='Carbon Morpher' ) c
where a.file_name = b.file_name
and b.file_name = c.file_name