Sql help (left outer join)

Question

Hi All,
I am referring 2 regular tables from the HR schema which you get when you install Oracle 9i , Now the issue is that I want all the rows from my employees table even if the row doesnt have the salary equal to 2500.
Here is my Sql:
select e.employee_id
     , e.first_name
     , e.last_name
     , e.salary
     , e.department_id e_dep_id
     , d.department_id d_dep_id
     , d.department_name
     , d.location_id
from employees e
, departments d
where 1 = 1
     And e.department_id = d.department_id(+) And e.SALARY = 2500
I am achieving my result set from the below query though(its just a syntactical problem) , please help :
select e.employee_id
     , e.first_name
     , e.last_name
     , e.salary
     , e.department_id e_dep_id
     , d.department_id d_dep_id
     , d.department_name
     , d.location_id
from employees e left outer join
departments d
on e.department_id = d.department_id And e.SALARY = 2500
Regards
Rahul

Answer 1

Mac_Freak_Rahul wrote:
Well my requirement is to pull all the records from my driving table(ie employees) doesnt matter weather the condition satisfies or not. Just to add to that lets say I would need to bring another table and my join criteria involves data from the employees table and the third table(in this case I need to make sure that all the rows from my driving table remains and doesnt get filter out). Please help my only problem is of the new syntax of outer joins.
Regards
RahulRahul,
Why do you want to use "oracle only syntax ( + )"? I highly recommend you to use ANSI syntax, it's much more readable:
This is from Oracle's documents:
Oracle recommends that you use the FROM clause OUTER JOIN syntax rather than the Oracle join operator. Outer join queries that use the Oracle join operator (+) are subject to the following > rules and restrictions, which do not apply to the FROM clause OUTER JOIN syntax:
You cannot specify the (+) operator in a query block that also contains FROM clause join syntax.
The (+) operator can appear only in the WHERE clause or, in the context of left-correlation (that is, when specifying the TABLE clause) in the FROM clause, and can be applied only to a column > of a table or view.
If A and B are joined by multiple join conditions, then you must use the (+) operator in all of these conditions. If you do not, then Oracle Database will return only the rows resulting from a > simple join, but without a warning or error to advise you that you do not have the results of an outer join.
The (+) operator does not produce an outer join if you specify one table in the outer query and the other table in an inner query.
You cannot use the (+) operator to outer-join a table to itself, although self joins are valid. For example, the following statement is not valid:
-- The following statement is not valid:
SELECT employee_id, manager_id
FROM employees
WHERE employees.manager_id(+) = employees.employee_id;
However, the following self join is valid:
SELECT e1.employee_id, e1.manager_id, e2.employee_id
FROM employees e1, employees e2
WHERE e1.manager_id(+) = e2.employee_id;
The (+) operator can be applied only to a column, not to an arbitrary expression. However, an arbitrary expression can contain one or more columns marked with the (+) operator.
A WHERE condition containing the (+) operator cannot be combined with another condition using the OR logical operator.
A WHERE condition cannot use the IN comparison condition to compare a column marked with the (+) operator with an expression.
A WHERE condition cannot compare any column marked with the (+) operator with a subquery.Best Regards,
Gokhan
If this question is answered, please mark appropriate posts as correct/helpful and the thread as closed. Thanks