NO_INDEX function in select statement : Select clause « Query Select « Oracle PL/SQL Tutorial

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Oracle PL/SQL Tutorial » Query Select » Select clause 
2.2.16.NO_INDEX function in select statement
SQL>
SQL>
SQL> CREATE TABLE employee
  2  (employee_id         NUMBER(7),
  3   last_name           VARCHAR2(25),
  4   first_name          VARCHAR2(25),
  5   userid              VARCHAR2(8),
  6   start_date          DATE,
  7   comments            VARCHAR2(255),
  8   manager_id          NUMBER(7),
  9   title               VARCHAR2(25),
 10   department_id       NUMBER(7),
 11   salary              NUMBER(112),
 12   commission_pct      NUMBER(42)
 13  );

Table created.

SQL>
SQL> INSERT INTO employee VALUES (1'V''Ben', 'cv',to_date('03-MAR-90 8:30', 'dd-mon-yy hh24:mi'),NULL, NULL, 'PRESIDENT', 502500, NULL);

row created.

SQL> INSERT INTO employee VALUES (2'N''Haidy', 'ln', '08-MAR-90', NULL,1'VP, OPERATIONS', 411450, NULL);

row created.

SQL> INSERT INTO employee VALUES (3'N''Molly', 'mn', '17-JUN-91',NULL, 1'VP, SALES', 311400, NULL);

row created.

SQL> INSERT INTO employee VALUES (4'S''Mark', 'mq', '07-APR-90',NULL, 1'VP, FINANCE', 101450, NULL);

row created.

SQL> INSERT INTO employee VALUES (5'R''AUDRY', 'ar', '04-MAR-90',NULL, 1'VP, ADMINISTRATION', 501550, NULL);

row created.

SQL> INSERT INTO employee VALUES (6'U''MOLLY', 'mu', '18-JAN-91',NULL, 2'WAREHOUSE MANAGER', 411200, NULL);

row created.

SQL> INSERT INTO employee VALUES (7'M''ROBERTA', 'rm', '14-MAY-90',NULL, 2'WAREHOUSE MANAGER', 411250, NULL);

row created.

SQL> INSERT INTO employee VALUES (8'B''BEN', 'ry', '07-APR-90', NULL, 2,'WAREHOUSE MANAGER', 411100, NULL);

row created.

SQL> INSERT INTO employee VALUES (9'C''Jane', 'ac', '09-FEB-92',NULL, 2'WAREHOUSE MANAGER', 411300, NULL);

row created.

SQL> INSERT INTO employee VALUES (10'H''Mart', 'mh', '27-FEB-91', NULL, 2,'WAREHOUSE MANAGER', 411307, NULL);

row created.

SQL>
SQL>
SQL>
SQL> SELECT /*+ NO_INDEX (employee employee_id_pk) */
  2         first_name, last_name
  3  FROM   employee
  4  WHERE  employee_id = 25;

no rows selected

SQL>
SQL>
SQL> drop table employee;

Table dropped.
2.2.Select clause
2.2.1.Performing Single Table SELECT Statements
2.2.2.Select employee first and last and sort by last name
2.2.3.List single column from a table
2.2.4.Use as to specify the alias name
2.2.5.Use function in select clause
2.2.6.Use more than one aggregate functions in a select statement
2.2.7.where clause
2.2.8.Compare with number
2.2.9.Concatenate string
2.2.10.Select from a Subquery
2.2.11.Select constant as a column
2.2.12.Negate a column value
2.2.13.Math calculation in select statement
2.2.14.Search for String Across Columns
2.2.15.Don't Perform the Same Calculation Over and Over
2.2.16.NO_INDEX function in select statement
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