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我在Oracle数据库三个表如下所示：连接表
Training_Calendar_hdr
-----------------------------
Training_Id Training_Name
-----------------------------
T1 Physics
T2 Chemistry
T3 Maths
Training_Employee_mapping
---------------------------
Training_Id Employee_Id
---------------------------
T1 E001
T1 E003
T1 E007
T3 E001
T3 E010
T3 E008
T3 E011
Employee_Details
---------------------------
Employee_Id Designation
---------------------------
E001 Engineer
E002 Professor
E003 Businessman
E004 Engineer
E005 Govt. Service
E006 Unemployed
E007 Engineer
E008 Govt. Service
E009 Professor
E010 Unemployed
E011 Professor
我需要通过连接三个表的结果如下所示：
--------------------------------------------------------------------------------
Training_Name Engineer Businessman Unemployed Professor Govt. Service
--------------------------------------------------------------------------------
Physics 2 1
Maths 1 1 1 1
你有没有试图自己做这个？ – Jacobm001
您是否希望在运行时从**指定**列中的值中获取列名？或者在编写查询时对它们进行硬编码？你很可能想要前者。这不能用纯SQL完成 - 它需要“动态SQL”（尽管名称不是SQL），这在大多数情况下是数据模型有缺陷的标志。将“名称”显示为列名可解决哪些业务问题？ – mathguy