Databases :: How To Avoid Duplicates In Sql With Joins

Oct 22, 2009

I am developing web application using csharp and oracle as a database. I have a three tables where I am pulling from records. But when write sql using inner joins and Outer join the records are being duplicated. These tables are being using joined using three(3) fields That are making up a compound primary key. How can I join them using an sql such that there is no duplicated. I am not allowed to modify the structure of the table. primary keys are in board

the tables are as follows;

Table1|:

STU_YEAR VARCHAR2(4)
Stu_CUO VARCHAR2(5)
STU_DEC VARCHAR2(17)
STU_NBER VARCHAR2(13)
STU_NBER NUMBER
STU_CODE VARCHAR2(3)
STU_BTCOD VARCHAR2(2)
STU_BASE NUMBER(18,2)
STU_RATE

Table2:

STU_YEAR VARCHAR2(4)
Stu_CUO VARCHAR2(5)
STU_DEC VARCHAR2(17)
CUP_CODE VARCHAR2(3)
CUP_BT VARCHAR2(2)

table3:

STU_YEAR VARCHAR2(4)
Stu_CUO VARCHAR2(5)
STU_DEC VARCHAR2(17)
KPP_CNAME VARCHAR2(3)
KPP_BTNAME VARCHAR2(2)

[Code]....



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