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SQL> create index test.ind_fun on test.testindex(upper(a));
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SQL> insert into testindex values('a',2);
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SQL> commit;
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SQL> select /*+ RULE*/* from test.testindex where upper(a)='A';
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-- ----------
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Execution Plan
----------------------------------------------------------
0¡¡¡¡SELECT STATEMENT Optimizer=HINT: RULE
1 0 TABLE ACCESS (FULL) OF 'TESTINDEX'
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SQL> select * from test.testindex where upper(a)='A';
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Execution Plan
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0¡¡¡¡SELECT STATEMENT Optimizer=CHOOSE (Cost=2 Card=1 Bytes=5)
1 0 TABLE ACCESS (BY INDEX ROWID) OF 'TESTINDEX' (Cost=2 Card=1 Bytes=5)
2 1 INDEX (RANGE SCAN) OF 'IND_FUN' (NON-UNIQUE) (Cost=1 Card=1)
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