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Outer join
A join that links two tables, one of which has rows that do not match those in the common column of the other table.


  
Total Answers and Comments: 1 Last Update: July 04, 2006   
  
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 Best Rated Answer
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Submitted by: Suresh
 

Outer Join - method of retreiving selected rows from one table that doesn't match rows with the other table.

Ex: Consider A & B two tables

SELECT eno, ename, a.dno, dname 

FROM a,b

WHERE a.dno=b.dno;

Output:

Eno        Ename           Dno              Dname

100        John               10               Accounts

101        Michael            20               Sales

                                   30              Production                

                                   40              Purchase

In outer join 2 types r there:

Left Outer Join & Right outer Join

Ex: LeftOuter Join

SELECT eno, ename, a.dno, dname 

FROM a,b

WHERE a.dno(+)=b.dno;

Display all the rows from "Table A".

Output:

Eno        Ename           Dno              Dname

100        John               10               Accounts

101        Michael            20               Sales

102        Anni                20               Sales                

103        Sonia              

105        Mann

Ex: Right Outer Join

SELECT eno, ename, a.dno, dname 

FROM a,b

WHERE a.dno=(+)b.dno;

Display all the rows from "Table B".

Output:

Eno        Ename           Dno              Dname

100        John               10               Accounts

101        Michael            20               Sales

102        Anni                20               Sales                

                                   30              Production                

                                   40              Purchase

Suresh



Above answer was rated as good by the following members:
ASHOK1324
July 04, 2006 22:01:40   #1  
Suresh        
RE: Outer join

Outer Join - method of retreiving selected rows from one table that doesn't match rows with the other table.

Ex: Consider A & B two tables

SELECT eno ename a.dno dname

FROM a b

WHERE a.dno b.dno;

Output:

Eno Ename Dno Dname

100 John 10 Accounts

101 Michael 20 Sales

30 Production

40 Purchase

In outer join 2 types r there:

Left Outer Join & Right outer Join

Ex: LeftOuter Join

SELECT eno ename a.dno dname

FROM a b

WHERE a.dno(+) b.dno;

Display all the rows from Table A .

Output:

Eno Ename Dno Dname

100 John 10 Accounts

101 Michael 20 Sales

102 Anni 20 Sales

103 Sonia

105 Mann

Ex: Right Outer Join

SELECT eno ename a.dno dname

FROM a b

WHERE a.dno (+)b.dno;

Display all the rows from Table B .

Output:

Eno Ename Dno Dname

100 John 10 Accounts

101 Michael 20 Sales

102 Anni 20 Sales

30 Production

40 Purchase

Suresh


 
Is this answer useful? Yes | NoAnswer is useful 1   Answer is not useful 0Overall Rating: +1    

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