Select Multiple accounts with multiple corresponding departments values

Question

I have a table with several account numbers that have corresponding department ID, and I am trying to select multiple specific accounts who have data in multiple specific department ID's.
This is where I started.
select * table1 a, table1 b, table1 c
where a.col1 in ('a.acc1','a.acc2','a.acc3')
and a.col2 in ('a.dep1','a.dep2')
and b.col1 in ('b.acc6','b.acc7','b.acc8')
and b.col2 in ('b.dep4','b.dep5','b.dep1')
table1
Col1 Col2 col3
acc1 dep1 21
acc1 dep2 32
acc2 dep1 44
acc2 dep2 29
acc2 dep3 320
acc3 dep1 10
acc6 dep4 312
acc7 dep3 234
acc8 dep2 2
acc9 dep1 132
What would be the most efficient way to build this query?
thanks

Answer 1

Like this?
SQL> WITH T
  2       AS (SELECT 'acc1' col1, 'dep1' col2, 21 col3 FROM DUAL
  3           UNION ALL
  4           SELECT 'acc1' col1, 'dep2' col2, 32 col3 FROM DUAL
  5           UNION ALL
  6           SELECT 'acc2' col1, 'dep1' col2, 44 col3 FROM DUAL
  7           UNION ALL
  8           SELECT 'acc2' col1, 'dep2' col2, 29 col3 FROM DUAL
  9           UNION ALL
10           SELECT 'acc2' col1, 'dep3' col2, 320 col3 FROM DUAL
11           UNION ALL
12           SELECT 'acc3' col1, 'dep1' col2, 10 col3 FROM DUAL
13           UNION ALL
14           SELECT 'acc6' col1, 'dep4' col2, 312 col3 FROM DUAL
15           UNION ALL
16           SELECT 'acc7' col1, 'dep3' col2, 234 col3 FROM DUAL
17           UNION ALL
18           SELECT 'acc8' col1, 'dep2' col2, 2 col3 FROM DUAL
19           UNION ALL
20           SELECT 'acc9' col1, 'dep1' col2, 132 col3 FROM DUAL)
21  SELECT *
22    FROM T;
COL1 COL2       COL3
acc1 dep1         21
acc1 dep2         32
acc2 dep1         44
acc2 dep2         29
acc2 dep3        320
acc3 dep1         10
acc6 dep4        312
acc7 dep3        234
acc8 dep2          2
acc9 dep1        132
10 rows selected.
SQL>
SQL> WITH T
  2       AS (SELECT 'acc1' col1, 'dep1' col2, 21 col3 FROM DUAL
  3           UNION ALL
  4           SELECT 'acc1' col1, 'dep2' col2, 32 col3 FROM DUAL
  5           UNION ALL
  6           SELECT 'acc2' col1, 'dep1' col2, 44 col3 FROM DUAL
  7           UNION ALL
  8           SELECT 'acc2' col1, 'dep2' col2, 29 col3 FROM DUAL
  9           UNION ALL
10           SELECT 'acc2' col1, 'dep3' col2, 320 col3 FROM DUAL
11           UNION ALL
12           SELECT 'acc3' col1, 'dep1' col2, 10 col3 FROM DUAL
13           UNION ALL
14           SELECT 'acc6' col1, 'dep4' col2, 312 col3 FROM DUAL
15           UNION ALL
16           SELECT 'acc7' col1, 'dep3' col2, 234 col3 FROM DUAL
17           UNION ALL
18           SELECT 'acc8' col1, 'dep2' col2, 2 col3 FROM DUAL
19           UNION ALL
20           SELECT 'acc9' col1, 'dep1' col2, 132 col3 FROM DUAL)
21  SELECT col1
22    FROM T
23  GROUP BY col1
24  HAVING COUNT (DISTINCT col2) > 1;
COL1
acc1
acc2
SQL> G.