Order date value by only year field with extract() function : EXTRACT « Date Timestamp Functions « Oracle PL/SQL Tutorial

Oracle PL/SQL Tutorial
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Oracle PL/SQL Tutorial » Date Timestamp Functions » EXTRACT 
13. 6. 15. Order date value by only year field with extract() function
SQL>
SQL>
SQL> CREATE TABLE emp (
  2    emp_id               NUMBER,
  3    ename             VARCHAR2(40),
  4    hire_date        DATE DEFAULT sysdate,
  5    end_date DATE,
  6    rate     NUMBER(5,2),
  7    CONSTRAINT emp_pk
  8      PRIMARY KEY (emp_id)
  9  );

Table created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (101'Mary', to_date('15-Nov-1961','dd-mon-yyyy'),null,169);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (102'Tom', to_date('16-Sep-1964','dd-mon-yyyy'),to_date('5-May-2004','dd-mon-yyyy'),135);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (104'Peter', to_date('29-Dec-1987','dd-mon-yyyy'),to_date('1-Apr-2004','dd-mon-yyyy'),99);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (105'Mike', to_date('15-Jun-2004','dd-mon-yyyy'),null,121);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (107'Less', to_date('2-Jan-2004','dd-mon-yyyy'),null,45);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (108'Park', to_date('1-Mar-1994','dd-mon-yyyy'),to_date('15-Nov-2004','dd-mon-yyyy'),220);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (110'Ink', to_date('4-Apr-2004','dd-mon-yyyy'),to_date('30-Sep-2004','dd-mon-yyyy'),84);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (111'Tike', to_date('23-Aug-1976','dd-mon-yyyy'),null,100);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (112'Inn', to_date('15-Nov-1961','dd-mon-yyyy'),to_date('4-Apr-2004','dd-mon-yyyy'),70);

row created.

SQL> INSERT INTO emp(emp_id, ename, hire_date,end_date, rate)VALUES (113'Kate', to_date('3-Mar-2004','dd-mon-yyyy'),to_date('31-Oct-2004','dd-mon-yyyy'),300);

row created.

SQL>
SQL> SET ECHO ON
SQL> SELECT e.emp_id "ID", e.ename "Name",
  2         e.hire_date "Hire Date"
  3  FROM emp e
  4  ORDER BY EXTRACT(YEAR FROM hire_dateDESC, ename ASC;
       110
Ink
04-APR-04

       113
Kate
03-MAR-04

       107
Less
02-JAN-04

       105
Mike
15-JUN-04

       108
Park
01-MAR-94

       104
Peter
29-DEC-87

       111
Tike
23-AUG-76

       102
Tom
16-SEP-64

       112
Inn
15-NOV-61

       101
Mary
15-NOV-61


10 rows selected.

SQL>
SQL> drop table emp;

Table dropped.
13. 6. EXTRACT
13. 6. 1. EXTRACT() to extract and return a year, month, day, hour, minute, second, or time zone from the timestamp types or a DATE.
13. 6. 2. SELECT EXTRACT(MONTH FROM TO_DATE('01-JAN-2005 19:15:26','DD-MON-YYYY HH24:MI:SS')) As MONTH
13. 6. 3. SELECT EXTRACT(YEAR FROM TO_DATE('01-JAN-2005 19:15:26','DD-MON-YYYY HH24:MI:SS')) AS YEAR
13. 6. 4. EXTRACT() gets the hour, minute, and second from a TIMESTAMP returned by TO_TIMESTAMP()
13. 6. 5. EXTRACT(MINUTE FROM TO_TIMESTAMP('01-JAN-2005 19:15:26', 'DD-MON-YYYY HH24:MI:SS')) AS MINUTE
13. 6. 6. EXTRACT(SECOND FROM TO_TIMESTAMP('01-JAN-2005 19:15:26', 'DD-MON-YYYY HH24:MI:SS')) AS SECOND
13. 6. 7. EXTRACT()gets the time zone hour, minute, second, region, and region abbreviation from a TIMESTAMP WITH TIMEZONE returned by TO_TIMESTAMP_TZ()
13. 6. 8. EXTRACT(TIMEZONE_MINUTE FROM TO_TIMESTAMP_TZ('01-JAN-2005 19:15:26 -7:15', 'DD-MON-YYYY HH24:MI:SS TZH:TZM'))
13. 6. 9. EXTRACT(TIMEZONE_REGION FROM TO_TIMESTAMP_TZ('01-JAN-2005 19:15:26 PST', 'DD-MON-YYYY HH24:MI:SS TZR'))
13. 6. 10. EXTRACT(TIMEZONE_ABBR FROM TO_TIMESTAMP_TZ('01-JAN-2005 19:15:26 PST', 'DD-MON-YYYY HH24:MI:SS TZR'))
13. 6. 11. extract year from birthday
13. 6. 12. extract month from birthday
13. 6. 13. extract day from birthday
13. 6. 14. Extract year, month, day from a date
13. 6. 15. Order date value by only year field with extract() function
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