CAn we write a query like this

Question

CAn we write a query like this?
If not how can this be changed?
select col1,col2,col3.col4
from table 1
where col1,col2 in(select col1,col2 from table2)

Answer 1

Or it may be identical:
SQL> CREATE TABLE t1 (c INT NOT NULL);
Table created.
SQL> CREATE TABLE t2 (c INT NOT NULL);
Table created.
SQL> INSERT ALL
  2  INTO t1 VALUES (rn)       
  3  INTO t2 VALUES (rn)
  4  SELECT rownum AS rn FROM user_tables WHERE rownum <= 15;
30 rows created.
SQL> BEGIN                                       
  2  DBMS_STATS.GATHER_TABLE_STATS(user,'T1');
  3  DBMS_STATS.GATHER_TABLE_STATS(user,'T2');
  4  END;
  5  /
PL/SQL procedure successfully completed.
SQL> SELECT * FROM t1
  2  WHERE  EXISTS
  3         ( SELECT 1 FROM t2 WHERE c = t1.c )
  4 
SQL> @xplan
| Id  | Operation            |  Name       | Rows  | Bytes | Cost  |
|   0 | SELECT STATEMENT     |             |    15 |    90 |     5 |
|*  1 |  HASH JOIN SEMI      |             |    15 |    90 |     5 |
|   2 |   TABLE ACCESS FULL  | T1          |    15 |    45 |     2 |
|   3 |   TABLE ACCESS FULL  | T2          |    15 |    45 |     2 |
Predicate Information (identified by operation id):
   1 - access("T2"."C"="T1"."C")
SQL> SELECT * FROM t1
  2  WHERE  c IN
  3         ( SELECT c FROM t2 )
  4 
SQL> @xplan
| Id  | Operation            |  Name       | Rows  | Bytes | Cost  |
|   0 | SELECT STATEMENT     |             |    15 |    90 |     5 |
|*  1 |  HASH JOIN SEMI      |             |    15 |    90 |     5 |
|   2 |   TABLE ACCESS FULL  | T1          |    15 |    45 |     2 |
|   3 |   TABLE ACCESS FULL  | T2          |    15 |    45 |     2 |
Predicate Information (identified by operation id):
   1 - access("T1"."C"="T2"."C")