sql - multiple non ansi join -


i asked use non ansi join given query: q) display records above tables following fields – employeeid, employee name, department id, department name, start_date of job, end date of job, job title, country name, region name, difference in maximum salary , employee’s salary

tables given standard in "hr" connection tables in oracle 11g

i used following query:

select e.employee_id,          first_name,           e.deparment_id,           department_name,           start_date,           end_date,           job_title,           country_name,           region_name,            (select max(salary) employees)-salary employees e,       countries c,        departments d,       job_history jh,       jobs j,          locations l,       regions r e.deparment_id = d.department_id  , jh.employee_id = e.employee_id , e.job_id = j.job_id , d.location_id = l.location_id  , l.country_id = c.country_id , c.region_id = r.region_id;

the output getting redundant on entries. need resolving redundancy.

my output 

101 neena    90 executive      28-10-93 15-03-97 president                     unites states of america americas  7000 101 neena    90 executive      21-09-89 27-10-93 president                     unites states of america americas  7000 102 lex      90 executive      13-01-93 24-07-98 administration vice president unites states of america americas  7000 200 jennifer 10 administration 01-07-94 31-12-98 administration assistant      unites states of america americas 19600 200 jennifer 10 administration 17-09-87 17-06-93 administration assistant      unites states of america americas 19600 176 jonathon 80 sales          01-01-99 31-12-99 sales representative          united kingdom           americas 15400 176 jonathon 80 sales          24-03-98 31-12-98 sales representative          united kingdom           americas 15400 201 michael  20 marketing      17-02-96 19-12-99 marketing manager             canada                   americas 11000

desired output there wouldn't redundant data can see 'neena' or 'jonathon' repeating.

so have cross join: join conditions don't identify unique keys each table, 1 or more tables multiple records causing repetition of "unique" attributes.

without source data it;s hard sure, i'd guess it's job_history table: start_date , end_date values unique in each row. easiest way fix additional join on job_id:

and e.job_id = jh.job_id

adding condition should cause job_history rows return latest role employee.


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