Where clause

WHERE specifies the rows you want to retrieve. You place the WHERE clause after the FROM clause:

SELECT ...
FROM ...
WHERE list of conditions;

In the following query, the WHERE clause is used to retrieve the row from the employee table where the employee number column is equal to 2:

CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
                      ENAME VARCHAR2(10),
                      HIREDATE DATE);

INSERT INTO EMP VALUES (1, 'SMITH', TO_DATE('17-DEC-1980', 'DD-MON-YYYY'));
INSERT INTO EMP VALUES (2, 'ALLEN', TO_DATE('20-FEB-1981', 'DD-MON-YYYY'));
INSERT INTO EMP VALUES (3, 'WARD',  TO_DATE('22-FEB-1981', 'DD-MON-YYYY'));
INSERT INTO EMP VALUES (4, 'JONES', TO_DATE('2-APR-1981',  'DD-MON-YYYY'));
INSERT INTO EMP VALUES (5, 'MARTIN',TO_DATE('28-SEP-1981', 'DD-MON-YYYY'));

SQL> SELECT *
  2  FROM emp
  3  WHERE empno = 2;

     EMPNO ENAME      HIREDATE
---------- ---------- ---------
         2 ALLEN      20-FEB-81

SQL>