oracle - SQL statement IN condition returns wrong results -


oracle: 11g

i have following (2) queries evaluate same data returns different results.

query 1:

select p.plant_code,                        p.description plant_desc,                        e.emp_id,                        e.division_code,                        m.module_code,                        c.course_code              plant p,                       employee e,                       courses c,                       modules_revision m,                       temp_qual_saved_result tqsr           e.plant_code = p.plant_code               , tqsr.emp_id = e.emp_id               , tqsr.course_code = c.course_code               , tqsr.module_code = m.module_code               , m.current_revision = 'y'               , c.course_status = 'a'               , tqsr.emp_status = 'a'               , e.plant_code in ('002088', '002096', '002105', '009247')               , m.module_status = 'a'               , e.division_code in (select ud.division_code user_division ud ud.user_id = 'gmd-ad-02')               , qual_type = 'm'       order p.plant_code,e.emp_id,m.module_code,c.course_code;

enter image description here query : 2

select p.plant_code,                        p.description plant_desc,                        e.emp_id,                        e.division_code,                        m.module_code,                        c.course_code              plant p,                       employee e,                       courses c,                       modules_revision m,                       temp_qual_saved_result tqsr           e.plant_code = p.plant_code               , tqsr.emp_id = e.emp_id               , tqsr.course_code = c.course_code               , tqsr.module_code = m.module_code               , m.current_revision = 'y'               , c.course_status = 'a'               , tqsr.emp_status = 'a'               , e.plant_code in ('002088', '002096', '002105', '009247')               , m.module_status = 'a'               , e.division_code in ('utn1','unc1','bcu2','deu6')               , qual_type = 'm'       order p.plant_code,e.emp_id,m.module_code,c.course_code;

enter image description here

query1 results display same value (009247) under plant_code column though brings employees other (3) columns.

query2 results display correct value under plant_code column each employee.

  1. why query1 displaying 1 value under plant_code though brings out employee plant_code contained in ('002088', '002096', '002105', '009247') ?

  2. running subquery "select ud.division_code user_division ud ud.user_id = 'gmd-ad-02'" returns values 'utn1','unc1','bcu2','deu6' same division list.

what difference when indicating list of values vs using select statement?


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