How to create multiple indexes for the same column in ORACLE 12C

Creating Multiple indexes in the same column does not seem to be implemented in other databases, but now ORACLE 12C can be implemented, the following describes how to create multiple indexes in the same column.

From ORACLE 12C, different types of indexes can be created on the same column for performance optimization. Different types of indexes mainly include (B * TREE vs BITMAP, Local vs Global)
ORACLE 11G

The Code is as follows:

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SQL> select * from v $ version; BANNER -------------------------------------------------------------------------------- Oracle Database 11g Enterprise Edition Release 11.2.0.3.0-Production PL/SQL Release 11.2.0.3.0-Production CORE 11.2.0.3.0 Production TNS for Linux: Version 11.2.0.3.0-Production NLSRTL Version 11.2.0.3.0-Production   SQL> CREATE TABLE T_XIFENFEI 2 ( 3 empno number (9) primary key, 4 EMPNAME VARCHAR2 (15) not null, 5) 6/   Table created.   SQL> CREATE INDEX EMP_DEPT_BTREE_IDX ON EMP (DEPTNO );   Index created.   SQL> CREATE BITMAP INDEX EMP_DEPTNO_BITMAP_IDX ON EMP (DEPTNO) INVISIBLE; Create bitmap index EMP_DEPTNO_BITMAP_IDX on emp (DEPTNO) INVISIBLE * ERROR at line 1: ORA-01408: such column list already indexed ORACLE 12C CDB_PDB @ CHF> select * from v $ version;   BANNER CON_ID ------------------------------------------------------------------------------------------ Oracle Database 12c Enterprise Edition Release 12.1.0.1.0-64bit Production 0 PL/SQL Release 12.1.0.1.0-Production 0 CORE 12.1.0.1.0 Production 0 TNS for 64-bit Windows: Version 12.1.0.1.0-Production 0 NLSRTL Version 12.1.0.1.0-Production 0   CDB_PDB @ CHF> create table T_XIFENFEI 2 ( 3 empno number (9) primary key, 4 EMPNAME VARCHAR2 (15) NOT NULL 5) 6/

The table has been created.

The Code is as follows:	Copy code
CDB_PDB @ CHF> create index EMP_DEPT_BTREE_IDX on emp (DEPTNO );

The index has been created.

The Code is as follows:	Copy code
CDB_PDB @ CHF> create bitmap index EMP_DEPTNO_BITMAP_IDX on emp (DEPTNO ); Create bitmap index EMP_DEPTNO_BITMAP_IDX on emp (DEPTNO)

*

Row 3 has an error:

ORA-01408: This column list is indexed

CDB_PDB @ CHF> create bitmap index EMP_DEPTNO_BITMAP_IDX on emp (DEPTNO) INVISIBLE;

The index has been created.