Oracle PL/SQL Tutorial/System Tables Data Dictionary/user ind columns

Getting Information on the Indexes on a Column

You can get information on the indexes on a column by querying user_ind_columns.

   <source lang="sql">

SQL> desc user_ind_columns;

Name                    Null?    Type
------------------------
INDEX_NAME                       VARCHAR2(30)
TABLE_NAME                       VARCHAR2(30)
COLUMN_NAME                      VARCHAR2(4000)
COLUMN_POSITION                  NUMBER
COLUMN_LENGTH                    NUMBER
CHAR_LENGTH                      NUMBER
DESCEND                          VARCHAR2(4)</source>
   
  

Output report for user_ind_columns

   <source lang="sql">

SQL> SQL> SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) ); Table created. SQL> SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK"); 1 row created. SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS"); 1 row created. SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO"); 1 row created. SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON"); 1 row created. SQL> SQL> create or replace procedure desc_table( p_tname in varchar2 ) AUTHID CURRENT_USER as

 2  begin
 3      dbms_output.put_line(p_tname );
 4      for z in ( select a.index_name, a.uniqueness from user_indexes a where a.table_name = upper(p_tname) and index_type = "NORMAL" )
 5      loop
 6          dbms_output.put( rpad(z.index_name,31) ||z.uniqueness );
 7          for y in ( select decode(column_position,1,"(",", ")|| column_name column_name
 8              from user_ind_columns b
 9             where b.index_name = z.index_name
10             order by column_position )
11          loop
12              dbms_output.put( y.column_name );
13          end loop;
14          dbms_output.put_line( ")" || " " );
15      end loop;
16
17  end;
18  /

Procedure created. SQL> SQL> grant execute on desc_table to public

 2  /

Grant succeeded. SQL> SQL> set serveroutput on format wrapped SQL> exec desc_table( "dept" ) dept PL/SQL procedure successfully completed. SQL> SQL> SQL> drop table dept; Table dropped. SQL></source>

Query table_name,index_name, index.uniqueness,index.status by joining user_indexes and user_ind_columns

   <source lang="sql">

SQL> SQL> CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,

 2                    ENAME VARCHAR2(10),
 3                    JOB VARCHAR2(9),
 4                    MGR NUMBER(4),
 5                    HIREDATE DATE,
 6                    SAL NUMBER(7, 2),
 7                    COMM NUMBER(7, 2),
 8                    DEPTNO NUMBER(2));

Table created. SQL> SQL> INSERT INTO EMP VALUES (7369, "SMITH", "CLERK", 7902, TO_DATE("17-DEC-1980", "DD-MON-YYYY"), 800, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7499, "ALLEN", "SALESMAN", 7698, TO_DATE("20-FEB-1981", "DD-MON-YYYY"), 1600, 300, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7521, "WARD", "SALESMAN", 7698, TO_DATE("22-FEB-1981", "DD-MON-YYYY"), 1250, 500, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7566, "JONES", "MANAGER", 7839, TO_DATE("2-APR-1981", "DD-MON-YYYY"), 2975, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7654, "MARTIN", "SALESMAN", 7698,TO_DATE("28-SEP-1981", "DD-MON-YYYY"), 1250, 1400, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7698, "BLAKE", "MANAGER", 7839,TO_DATE("1-MAY-1981", "DD-MON-YYYY"), 2850, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7782, "CLARK", "MANAGER", 7839,TO_DATE("9-JUN-1981", "DD-MON-YYYY"), 2450, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7788, "SCOTT", "ANALYST", 7566,TO_DATE("09-DEC-1982", "DD-MON-YYYY"), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7839, "KING", "PRESIDENT", NULL,TO_DATE("17-NOV-1981", "DD-MON-YYYY"), 5000, NULL, 10); 1 row created. SQL> INSERT INTO EMP VALUES (7844, "TURNER", "SALESMAN", 7698,TO_DATE("8-SEP-1981", "DD-MON-YYYY"), 1500, 0, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7876, "ADAMS", "CLERK", 7788,TO_DATE("12-JAN-1983", "DD-MON-YYYY"), 1100, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7900, "JAMES", "CLERK", 7698,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 950, NULL, 30); 1 row created. SQL> INSERT INTO EMP VALUES (7902, "FORD", "ANALYST", 7566,TO_DATE("3-DEC-1981", "DD-MON-YYYY"), 3000, NULL, 20); 1 row created. SQL> INSERT INTO EMP VALUES (7934, "MILLER", "CLERK", 7782,TO_DATE("23-JAN-1982", "DD-MON-YYYY"), 1300, NULL, 10); 1 row created. SQL> SQL> CREATE TABLE DEPT (DEPTNO NUMBER(2),DNAME VARCHAR2(14),LOC VARCHAR2(13) ); Table created. SQL> SQL> INSERT INTO DEPT VALUES (10, "ACCOUNTING", "NEW YORK"); 1 row created. SQL> INSERT INTO DEPT VALUES (20, "RESEARCH", "DALLAS"); 1 row created. SQL> INSERT INTO DEPT VALUES (30, "SALES", "CHICAGO"); 1 row created. SQL> INSERT INTO DEPT VALUES (40, "OPERATIONS", "BOSTON"); 1 row created. SQL> SQL> select table_name

 2  ,        index_name
 3  ,        i.uniqueness as unq
 4  ,        i.status
 5  ,        ic.column_name
 6  from     user_indexes     i  join
 7           user_ind_columns ic using (table_name,index_name)
 8  where    table_name in ("EMPLOYEES","DEPARTMENTS")
 9  order by table_name
10  ,        index_name
11  ,        unq
12  ,        ic.column_position;

no rows selected SQL> SQL> drop table emp; Table dropped. SQL> drop table dept; Table dropped. SQL></source>

user_indexes join user_ind_columns ic using (table_name,index_name)

   <source lang="sql">

SQL> SQL> SQL> SQL> col table_name format a15 SQL> col index_name format a15 SQL> col unq format a9 SQL> col column_name format a15 SQL> SQL> set linesize 80 SQL> SQL> break on table_name skip 1 - > on index_name - > on unq - > on status SQL> SQL> select table_name

 2  ,        index_name
 3  ,        i.uniqueness as unq
 4  ,        i.status
 5  ,        ic.column_name
 6  from     user_indexes     i  join
 7           user_ind_columns ic using (table_name,index_name)
 8  where    table_name in ("EMP","DEPARTMENTS")
 9  order by table_name
10  ,        index_name
11  ,        unq
12  ,        ic.column_position;

no rows selected SQL> SQL> --clear breaks SQL></source>