|
SQL>
SQL>
SQL>
SQL> create table myTable1 as select *
2 from all_objects where ROWNUM <=000;
Table created.
SQL>
SQL>
SQL>
SQL>
SQL> create table myTable2 as select *
2 from all_objects where ROWNUM <= 9950;
Table created.
SQL>
SQL>
SQL>
SQL>
SQL> create index myTable2_idx on myTable2(object_id);
Index created.
SQL>
SQL>
SQL> select count(*) from myTable1 rbo
2 where object_id not in ( select object_id from myTable2 )
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL> select count(*) from myTable1 rbo
2 where NOT EXISTS (select null from myTable2 where myTable2.object_id = rbo.object_id )
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> select count(*) from myTable1, myTable2 rbo
2 where myTable1.object_id = rbo.object_id(+) and rbo.object_id IS NULL
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> analyze table myTable1 compute statistics;
Table analyzed.
SQL>
SQL>
SQL>
SQL> analyze table myTable2 compute statistics;
Table analyzed.
SQL>
SQL>
SQL>
SQL>
SQL> select count(*) from myTable1 cbo
2 where object_id not in ( select object_id from myTable2 )
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> select count(*) from myTable1 cbo
2 where object_id not in ( select object_id from myTable2 )
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> select count(*) from myTable1 cbo
2 where object_id not in ( select object_id from myTable2 )
3 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> alter table myTable2 modify object_id null;
Table altered.
SQL>
SQL>
SQL>
SQL> select count(*)
2 from
3 myTable1 cbo where object_id not in ( select object_id from myTable2 )
4 /
COUNT(*)
----------
0
SQL>
SQL>
SQL>
SQL>
SQL> drop table myTable1;
Table dropped.
SQL>
SQL>
SQL>
SQL> drop table myTable2;
Table dropped.
SQL>
SQL>
SQL>
SQL>
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