Rewrite the left join

Question

The following code work, but I would like to rewrite them to left join on style, how to do it
select *
from a, b, c , d, e
, v_codeNumber f
where a.my_numb ='5582017'
and a.username = b.username
and c.username = b.username
and c.DEPARTMENT_CODE= d.TDEPT_CODE
and c.discipline_num = f.discipline_num(+)

Answer 1

Hi,
Here's one way:
SELECT  *
FROM                    a
JOIN                     b  ON   a.username        = b.username
JOIN                     c  ON     c.username         = b.username
JOIN                     d  ON     c.department_code  = d.tdept_code
LEFT OUTER JOIN      v_codeNumber   f  ON     c.discipline_num   = f.discipline_num
CROSS JOIN                e
WHERE   a.my_numb = '5582017' Conditions involving 2 (or more) tables go in ON clauses, not in the WHERE clause.
Conditions using
(+)become part of an outer join.
Tables (like e, above) that are not connected to other tables are probably mistakes; otherwise, they become CROSS JOINs, and appear after all the other joins.