Example of MySql command

-EXAMPLE COMMAND-

Create a database on the sql server.

mysql> create database [databasename];

List all databases on the sql server.

mysql> show databases;

Switch to a database.

mysql> use [db name];

To see all the tables in the db.

mysql> show tables;

To see database's field formats.

mysql> describe [table name];

To delete a db.

mysql> drop database [database name];

To delete a table.

mysql> drop table [table name];

Show all data in a table.

mysql> SELECT * FROM [table name];

Returns the columns and column information pertaining to the designated table.

mysql> show columns from [table name];

Show certain selected rows with the value "whatever".

mysql> SELECT * FROM [table name] WHERE [field name] = "whatever";

Show all records containing the name "Bob" AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name = "Bob" AND phone_number = '3444444';

Show all records not containing the name "Bob" AND the phone number '3444444' order by the phone_number field.

mysql> SELECT * FROM [table name] WHERE name != "Bob" AND phone_number = '3444444' order by phone_number;

Show all records starting with the letters 'bob' AND the phone number '3444444'.

mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444';

Show all records starting with the letters 'bob' AND the phone number '3444444' limit to records 1 through 5.

mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444' limit 1,5;

Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a.

mysql> SELECT * FROM [table name] WHERE rec RLIKE "^a";

Show unique records.

mysql> SELECT DISTINCT [column name] FROM [table name];

Show selected records sorted in an ascending (asc) or descending (desc).

mysql> SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;

Return number of rows.

mysql> SELECT COUNT(*) FROM [table name];

Sum column.

mysql> SELECT SUM(*) FROM [table name];

To update info already in a table.

mysql> UPDATE [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [field name] = 'user';

Delete a row(s) from a table.

mysql> DELETE from [table name] where [field name] = 'whatever';

Update database permissions/privilages.

mysql> flush privileges;

Delete a column.

mysql> alter table [table name] drop column [column name];

Add a new column to db.

mysql> alter table [table name] add column [new column name] varchar (20);

Change column name.

mysql> alter table [table name] change [old column name] [new column name] varchar (50);

Make a unique column so you get no dupes.

mysql> alter table [table name] add unique ([column name]);

Make a column bigger.

mysql> alter table [table name] modify [column name] VARCHAR(3);

Delete unique from table.

mysql> alter table [table name] drop index [colmn name];

Create table with default and constraint.

mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'bato');

Add column in between after other column.

mysql> ALTER TABLE contacts ADD email VARCHAR(60) AFTER name;

Add column the be the first column.

mysql> ALTER TABLE contacts ADD email VARCHAR(60) FIRST;

Add primary key.

mysql> alter table employees add primary key (empid);

Insert multiple value.

INSERT INTO [table]

( [field1], [field2], [field3] ) VALUES

( '[value1.1]', '[value1.2]', '[value1.3]' ),

( '[value2.1]', '[value2.2]', '[value2.3]' ),

( '[value3.1]', '[value3.2]', '[value3.3]' );

Change column name(date to dateofbirth).

mysql> alter table employees change date dateofbirth date;

Select / display Minumun or lowest

(salary =columnname,minsalary=newcolumn name,employee=table) .

mysql> select min(salary)as MinSalary from employee;

Select / display maximum or highest.

mysql> select max(salary)as MaxSalary from employee;

Select / display average.

mysql> SELECT avg( mark ) FROM student;

Display unique or no repeat value.

mysql> SELECT distinct [column1], [column2]

FROM [table];

REFERENCES:

http://www.plus2net.com

http://www.roseindia.net

http://answers.yahoo.com

http://www.tutorialspoint.com

http://www.pantz.org

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