SQL/MySQL/Table Index/Delete Table

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Create, insert and drop a table

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CREATE TABLE t1 ( 

   c1 INT

); INSERT INTO t1 VALUES (12); SELECT * FROM t1; DROP TABLE t1; 

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How to delete a table

   <source lang="sql">

/*mysql> Drop table employee; Query OK, 0 rows affected (0.00 sec) mysql> CREATE TABLE employee ( 

   ->     id int unsigned not null auto_increment primary key,
   ->     firstname varchar(20),
   ->     lastname varchar(20),
   ->     title varchar(30),
   ->     age int,
   ->     yearofservice int,
   ->     salary int,
   ->     perks int,
   ->     email varchar(60)
   -> );

Query OK, 0 rows affected (0.04 sec) mysql> select * from employee; +----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+ | id | firstname | lastname | title | age | yearofservice| salary | perks | email | +----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+ | 1 | John | Chen | Senior Programmer | 31 | 3| 120000 | 25000 | j@hotmail.ru | | 2 | Jan | Pillai | Senior Programmer | 32 | 4| 110000 | 20000 | g@yahoo.ru | | 3 | Ane | Pandit | Web Designer | 24 | 3| 90000 | 15000 | a@gmail.ru | | 4 | Mary | Anchor | Web Designer | 27 | 2| 85000 | 15000 | m@mail.ru | | 5 | Fred | King | Programmer | 32 | 3| 75000 | 15000 | f@net.ru | | 6 | John | Mac | Programmer | 32 | 4| 80000 | 16000 | j@hotmail.ru | | 7 | Arthur | Sam | Programmer | 28 | 2| 75000 | 14000 | e@yahoo.ru | | 8 | Alok | Nanda | Programmer | 32 | 3| 70000 | 10000 | a@yahoo.ru | | 9 | Susan | Ra | Multimedia Programmer | 32 | 4| 90000 | 15000 | h@gmail.ru | | 10 | Paul | Simon | Multimedia Programmer | 23 | 1| 85000 | 12000 | ps@gmail.ru | | 11 | Edward | Parhar | Multimedia Programmer | 30 | 2| 75000 | 15000 | a@hotmail.ru | | 12 | Kim | Hunter | Senior Web Designer | 32 | 4| 110000 | 20000 | kim@coolmail.ru | | 13 | Roger | Lewis | System Administrator | 32 | 3| 100000 | 13000 | roger@mail.ru | | 14 | Danny | Gibson | System Administrator | 31 | 2| 90000 | 12000 | danny@hotmail.ru | | 15 | Mike | Harper | Senior Marketing Executive | 36 | 1| 120000 | 28000 | m@gmail.ru | | 16 | Mary | Sunday | Marketing Executive | 31 | 5| 90000 | 25000 | monica@bigmail.ru | | 17 | Jack | Sim | Marketing Executive | 27 | 1| 70000 | 18000 | hal@gmail.ru | | 18 | Joe | Irvine | Marketing Executive | 27 | 1| 72000 | 18000 | joseph@hotmail.ru | | 19 | Henry | Ali | Customer Service Manager | 32 | 3| 70000 | 9000 | shahida@hotmail.ru | | 20 | Peter | Champion | Finance Manager | 32 | 2| 120000 | 25000 | peter@yahoo.ru | +----+-----------+----------+----------------------------+------+---------------+--------+-------+---------------------+ 20 rows in set (0.00 sec) mysql> DROP TABLE employee; Query OK, 0 rows affected (0.00 sec)

  • /

Drop table employee; CREATE TABLE employee ( 

   id int unsigned not null auto_increment primary key,
   firstname varchar(20),
   lastname varchar(20),
   title varchar(30),
   age int,
   yearofservice int,
   salary int,
   perks int,
   email varchar(60)

); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("John", "Chen", "Senior Programmer", 31, 3, 120000, 25000, "j@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Jan", "Pillai", "Senior Programmer", 32, 4, 110000, 20000, "g@yahoo.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Ane", "Pandit", "Web Designer", 24, 3, 90000, 15000, "a@gmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Mary", "Anchor", "Web Designer", 27, 2, 85000, 15000, "m@mail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Fred", "King", "Programmer", 32, 3, 75000, 15000, "f@net.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("John", "Mac", "Programmer", 32, 4, 80000, 16000, "j@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Arthur", "Sam", "Programmer", 28, 2, 75000, 14000, "e@yahoo.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Alok", "Nanda", "Programmer", 32, 3, 70000, 10000, "a@yahoo.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Susan", "Ra", "Multimedia Programmer", 32, 4, 90000, 15000, "h@gmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Paul", "Simon", "Multimedia Programmer", 23, 1, 85000, 12000, "ps@gmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Edward", "Parhar", "Multimedia Programmer", 30, 2, 75000, 15000, "a@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Kim", "Hunter", "Senior Web Designer", 32, 4, 110000, 20000, "kim@coolmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Roger", "Lewis", "System Administrator", 32, 3, 100000, 13000, "roger@mail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Danny", "Gibson", "System Administrator", 31, 2, 90000, 12000, "danny@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Mike", "Harper", "Senior Marketing Executive", 36, 1, 120000, 28000, "m@gmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Mary", "Sunday", "Marketing Executive", 31, 5, 90000, 25000, "monica@bigmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Jack", "Sim", "Marketing Executive", 27, 1, 70000, 18000, "hal@gmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Joe", "Irvine", "Marketing Executive", 27, 1, 72000, 18000, "joseph@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Henry", "Ali", "Customer Service Manager", 32, 3, 70000, 9000, "shahida@hotmail.ru"); INSERT INTO employee (firstname, lastName, title, age, yearofservice, salary, perks, email) values ("Peter", "Champion", "Finance Manager", 32, 2, 120000, 25000, "peter@yahoo.ru"); select * from employee; DROP TABLE employee; select * from employee; 

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Remove two tables at the same time

   <source lang="sql">

/* mysql> select * from timeTable; +------+-------+------+ | year | month | day | +------+-------+------+ | 2001 | 01 | 01 | | 2002 | 06 | 20 | | 2003 | 05 | 30 | | 2004 | 02 | 02 | | 2005 | 04 | 23 | | 2006 | 03 | 23 | | 2001 | 01 | 01 | | 2002 | 06 | 20 | | 2003 | 05 | 30 | | 2004 | 02 | 02 | | 2005 | 04 | 23 | | 2006 | 03 | 23 | +------+-------+------+ 12 rows in set (0.01 sec) mysql> INSERT INTO copy_timeTable 

   -> SELECT * FROM timeTable
   -> WHERE year=2001;

Query OK, 2 rows affected (0.01 sec) Records: 2 Duplicates: 0 Warnings: 0 mysql> show tables; +----------------+ | Tables_in_t | +----------------+ | copy_timetable | | sales | | timetable | +----------------+ 3 rows in set (0.01 sec) mysql> DROP TABLE copy_TimeTable, TimeTable; Query OK, 0 rows affected (0.02 sec) mysql> show tables; +-------------+ | Tables_in_t | +-------------+ | sales | +-------------+ 1 row in set (0.00 sec)

  • /

Drop table timeTable; Drop table copy_timeTable;

CREATE TABLE timeTable ( 

   year YEAR(4), 
   month INT(2) UNSIGNED ZEROFILL,
   day INT(2) UNSIGNED ZEROFILL

); CREATE TABLE copy_timeTable ( 

   year YEAR(4), 
   month INT(2) UNSIGNED ZEROFILL,
   day INT(2) UNSIGNED ZEROFILL

);

INSERT INTO timeTable VALUES(2001,1,1), 

                           (2002,6,20),
                           (2003,5,30),
                           (2004,2,2),
                           (2005,4,23),
                           (2006,3,23);

select * from timeTable; INSERT INTO copy_timeTable SELECT * FROM timeTable WHERE year=2001; show tables;

DROP TABLE copy_TimeTable, TimeTable;

show tables; 


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