SQL/MySQL/Date Time/Year
Date function: YEAR
/*
mysql> Drop table Bird;
Query OK, 0 rows affected (0.01 sec)
mysql> CREATE TABLE Bird (
-> name VARCHAR(20),
-> owner VARCHAR(20),
-> species VARCHAR(20),
-> sex CHAR(1),
-> birth DATE,
-> death DATE
-> );
Query OK, 0 rows affected (0.04 sec)
mysql> INSERT INTO Bird VALUES ("BlueBird","Joe","Car","f","1999-03-30",NULL);
Query OK, 1 row affected (0.01 sec)
mysql> INSERT INTO Bird VALUES ("RedBird","Yin","Bus","m","1979-04-30",NULL);
Query OK, 1 row affected (0.00 sec)
mysql> INSERT INTO Bird VALUES ("RedBird","Yin","Bus","m","1998-01-30",NULL);
Query OK, 1 row affected (0.00 sec)
mysql> select * from Bird;
+----------+-------+---------+------+------------+-------+
| name | owner | species | sex | birth | death |
+----------+-------+---------+------+------------+-------+
| BlueBird | Joe | Car | f | 1999-03-30 | NULL |
| RedBird | Yin | Bus | m | 1979-04-30 | NULL |
| RedBird | Yin | Bus | m | 1998-01-30 | NULL |
+----------+-------+---------+------+------------+-------+
3 rows in set (0.00 sec)
mysql> /*how old each a Bird is*/
mysql> SELECT name, birth, CURDATE(),
-> (YEAR(CURDATE())-YEAR(birth))
-> - (RIGHT(CURDATE(),5)<RIGHT(birth,5))
-> AS age
-> FROM Bird ORDER BY name;
+----------+------------+------------+------+
| name | birth | CURDATE() | age |
+----------+------------+------------+------+
| BlueBird | 1999-03-30 | 2005-10-09 | 6 |
| RedBird | 1979-04-30 | 2005-10-09 | 26 |
| RedBird | 1998-01-30 | 2005-10-09 | 7 |
+----------+------------+------------+------+
3 rows in set (0.00 sec)
*/
Drop table Bird;
CREATE TABLE Bird (
name VARCHAR(20),
owner VARCHAR(20),
species VARCHAR(20),
sex CHAR(1),
birth DATE,
death DATE
);
INSERT INTO Bird VALUES ("BlueBird","Joe","Car","f","1999-03-30",NULL);
INSERT INTO Bird VALUES ("RedBird","Yin","Bus","m","1979-04-30",NULL);
INSERT INTO Bird VALUES ("RedBird","Yin","Bus","m","1998-01-30",NULL);
select * from Bird;
/*how old each a Bird is*/
SELECT name, birth, CURDATE(),
(YEAR(CURDATE())-YEAR(birth))
- (RIGHT(CURDATE(),5)<RIGHT(birth,5))
AS age
FROM Bird ORDER BY name;
Retrieve year from a date
SELECT YEAR(CURRENT_DATE);
/*mysql> SELECT YEAR(CURRENT_DATE);
+--------------------+
| YEAR(CURRENT_DATE) |
+--------------------+
| 2005 |
+--------------------+
1 row in set (0.00 sec)
*/
Use YEAR in where clause
/*
mysql> select * from employee_person;
+----+-------------------------------------+---------+---------------------------+------------+------+----------+-----------------+----------+
| id | address | phone | email | birthday | sex | m_status | s_name | children |
+----+-------------------------------------+---------+---------------------------+------------+------+----------+-----------------+----------+
| 1 | 200, Regina Street | 7176666 | net@hotmail.ru | 1971-04-26 | M | Y | Ane Regina | NULL |
| 2 | 1232 Alberta Road | 5553312 | jo@hotmail.ru | 1968-03-02 | M | Y | Jane Van | 3 |
| 3 | 90 Potter A | 3331211 | gp@ymail.ru | 1967-09-22 | M | N | Sandhya Pil | 2 |
| 4 | 202, Donna Street | 7176167 | twink@hotmail.ru | 1976-08-09 | F | Y | Manish Sha | NULL |
| 5 | Apartment #8, UBC, Van Street | 8973242 | holy@ymail.ru | 1974-10-14 | F | N | NULL | NULL |
| 6 | 46 SFU Street | 6451234 | kill@el.ru | 1978-12-31 | M | N | NULL | NULL |
| 7 | 432 Mercury Ave | 7932232 | mac@hotmail.ru | 1966-08-21 | M | Y | Mary Shelly | 3 |
| 8 | 8 Little YaleTown | 5442994 | edd@gmail.ru | 1975-01-14 | M | N | NULL | NULL |
| 9 | 64 Temp Road | 4327652 | nan@pmail.ru | 1969-05-19 | M | Y | Man Nanda | 1 |
| 10 | 132 Metro House, Henry Street | 5552376 | ra@hotmail.ru | 1968-07-06 | M | N | NULL | NULL |
| 11 | 1 Grace Town, Van Avenue | 5433879 | soundofsilence@boxer.net | 1957-11-04 | M | Y | Muriel Lovelace | 4 |
| 12 | 97 Oakland Road | 5423311 | kingarthur@roundtable.org | 1968-02-15 | M | Y | Rina Brighton | 3 |
| 13 | 543 Applegate Lane | 3434343 | levy@cmail.ru | 1968-09-03 | F | Y | Matt Shi | 2 |
| 14 | 76 Fish Street | 7432433 | tink@email.ru | 1965-04-28 | M | N | NULL | NULL |
| 15 | 98 Gun Street | 6500787 | danny@fhardy.ru | 1966-06-23 | M | Y | Betty Cudly | 3 |
| 16 | #5 Winnepag Homes | 5433243 | mike@cmail.ru | 1964-03-06 | M | Y | Stella Stevens | 2 |
| 17 | 652 Devon Building, 6th Jade Avenue | 5537885 | mona@darling.ru | 1970-04-18 | F | Y | Edgar Alan | 1 |
| 18 | Apartment #9, Together Towers | 5476565 | odessey@hotmail.ru | 1973-10-09 | M | N | NULL | NULL |
| 19 | Apartment #9, West Towers | 5476565 | jire@hotmail.ru | 1973-01-20 | M | N | NULL | NULL |
| 20 | 90 Yale Town | 7528326 | help@more.org | 1968-01-25 | F | N | NULL | NULL |
| 21 | 4329 Eucalyptus Avenue | 4254863 | money@cold.ru | 1964-06-13 | M | Y | Ruby Richer | 2 |
+----+-------------------------------------+---------+---------------------------+------------+------+----------+-----------------+----------+
21 rows in set (0.00 sec)
mysql> select id, birthday
-> from employee_person
-> where year(birthday) = 1972;
Empty set (0.00 sec)
*/
Drop table employee_person;
CREATE TABLE employee_person (
id int unsigned not null primary key,
address varchar(60),
phone int,
email varchar(60),
birthday DATE,
sex ENUM("M", "F"),
m_status ENUM("Y","N"),
s_name varchar(40),
children int
);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name) values (1, "200, Regina Street", 7176666, "net@hotmail.ru", "1971-04-26", "M", "Y", "Ane Regina");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (2, "1232 Alberta Road", 5553312, "jo@hotmail.ru", "1968-03-02", "M", "Y", "Jane Van", 3);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (3, "90 Potter A", 3331211, "gp@ymail.ru", "1967-09-22", "M", "N", "Sandhya Pil", 2);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name) values (4, "202, Donna Street", 7176167, "twink@hotmail.ru", "1976-08-09", "F", "Y", "Manish Sha");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (5, "Apartment #8, UBC, Van Street", 8973242, "holy@ymail.ru", "1974-10-14", "F", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (6, "46 SFU Street", "6451234", "kill@el.ru", "1978-12-31", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (7, "432 Mercury Ave", 7932232, "mac@hotmail.ru", "1966-8-21", "M", "Y", "Mary Shelly", "3");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (8, "8 Little YaleTown", 5442994, "edd@gmail.ru", "1975-01-14", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (9, "64 Temp Road", 4327652, "nan@pmail.ru", "1969-05-19", "M", "Y", "Man Nanda", "1");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (10, "132 Metro House, Henry Street", 5552376, "ra@hotmail.ru", "1968-07-06", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (11, "1 Grace Town, Van Avenue", 5433879, "soundofsilence@boxer.net", "1957-11-04", "M", "Y", "Muriel Lovelace", "4");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (12, "97 Oakland Road", 5423311, "kingarthur@roundtable.org", "1968-02-15", "M", "Y", "Rina Brighton", 3);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (13, "543 Applegate Lane", 3434343, "levy@cmail.ru", "1968-09-03", "F", "Y", "Matt Shi", "2");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (14, "76 Fish Street", 7432433, "tink@email.ru", "1965-04-28", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (15, "98 Gun Street", 6500787, "danny@fhardy.ru", "1966-06-23", "M", "Y", "Betty Cudly", 3);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (16, "#5 Winnepag Homes", 5433243, "mike@cmail.ru", "1964-03-06", "M", "Y", "Stella Stevens", 2);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (17, "652 Devon Building, 6th Jade Avenue", 5537885, "mona@darling.ru", "1970-04-18", "F", "Y", "Edgar Alan", 1);
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (18, "Apartment #9, Together Towers", 5476565, "odessey@hotmail.ru", "1973-10-09", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (19, "Apartment #9, West Towers", 5476565, "jire@hotmail.ru", "1973-1-20", "M", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status) values (20, "90 Yale Town", 7528326, "help@more.org", "1968-01-25", "F", "N");
INSERT INTO employee_person (id, address, phone, email, birthday, sex, m_status, s_name, children) values (21, "4329 Eucalyptus Avenue", 4254863, "money@cold.ru", "1964-06-13", "M", "Y", "Ruby Richer", 2);
select * from employee_person;
select id, birthday
from employee_person
where year(birthday) = 1972;