Both equii join and natural join are equall.will both display same output

Question

both equii join and natural join are equall.will both display same
output?

Answer 1

Hi ,
What is preventing you to do a small test and check yourself?
See the below link.
http://psoug.org/reference/joins.html
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> CREATE TABLE parents (
  2  person_id  NUMBER(5),
  3  adult_name VARCHAR2(20),
  4  comments   VARCHAR2(40))
  5  PCTFREE 0;
Table created.
SQL>
SQL> CREATE TABLE children (
  2  parent_id    NUMBER(5),
  3  person_id    NUMBER(5),
  4  child_name   VARCHAR2(20),
  5  comments     VARCHAR2(40))
  6  PCTFREE 0;
Table created.
SQL>
SQL> INSERT INTO parents VALUES (1, 'Dan', 'So What');
1 row created.
SQL> INSERT INTO parents VALUES (2, 'Jack', 'Who Cares');
1 row created.
SQL> INSERT INTO children VALUES (1, 2, 'Anne', 'Who Cares');
1 row created.
SQL> INSERT INTO children VALUES (1, 1, 'Julia', 'Yeah Right');
1 row created.
SQL> INSERT INTO children VALUES (2, 1, 'Marcella', 'So What');
1 row created.
SQL> COMMIT;
Commit complete.
SQL>
SQL> SELECT adult_name, child_name
  2  FROM parents NATURAL JOIN children;
ADULT_NAME           CHILD_NAME
Jack                 Anne
Dan                  Marcella
SQL> select adult_name,child_name from parents a, children b
  2  where a.person_id=b.person_id;
ADULT_NAME           CHILD_NAME
Jack                 Anne
Dan                  Julia
Dan                  Marcella
SQL> ed
Wrote file afiedt.buf
  1  select adult_name,child_name from parents a, children b
  2* where a.person_id=b.parent_id
SQL> /
ADULT_NAME           CHILD_NAME
Dan                  Anne
Dan                  Julia
Jack                 Marcella
SQL>Regards,
Avinash