Managing MYSL on Linux

Important MYSQL commands

Field Types in SQL

INTEGER - A whole number
VARCHAR(10) - Up to 10 characters.
CHAR(10) - Fixed number of characters
DATE - A date
DATETIME - Date and time
FLOAT - Floating point numbers


Field Types specific to MySQL

TEXT - Allows up to 65535 characters
DECIMAL(10,2) - Up to 10 digits before the point, 2 after.

mysqld - MySQL server daemon

safe_mysqld - Server process monitor

mysqlaccess - Tool for creating MySQL users

mysqladmin - Utility for administering MySQL

mysqldump - Tool for dumping the contents of a MySQL database. Useful for backing up a database from within the console.

mysql - Command line interface to MySQL

mysqlshow - List all MySQL database

Field Types specific to MySQL
TEXT - Allows up to 65535 characters
DECIMAL(10,2) - Up to 10 digits before the point, 2 after.
TO create the Database

$ mysqladmin --user=ravi --password=xxx create database addressdb

To use the Database
$ mysql --user=ravi --password=xxx
mysql> USE addressdb,

To create Table
mysql> CREATE TABLE p_addr (i INTEGER PRIMARY KEY,address TEXT,email VARCHAR(30),pincode DECIMAL(10),phone DECIMAL(15),website TEXT);
To add a column "india" to the table
mysql> ALTER TABLE p_addr ADD india VARCHAR(30);

To insert value in Table
mysql> INSERT INTO p_addr VALUES (1,"My, present, address","prakash@xyz.com",681024,2122536, "http://gadbu.blogspot.com","Prakash");

To List the contents of the Table
mysql> SELECT * FROM p_addr;

To delete a row from Table
mysql> DELETE FROM p_addr WHERE i=1;

To Rename a column in the table from "address" to "home_address"
mysql> ALTER TABLE p_addr CHANGE address home_address INTEGER;
Note: You cannot use this method to rename a column which is a primary key.

Change an existing record in the table

 mysql> UPDATE p_addr SET name="Sumitra" WHERE i=2;

Delete the table from the database
mysql> DROP TABLE p_addr;

List the databases
$ mysqlshow --user=ravi --password=xxx

List the tables in the database "addressdb"
$ mysqlshow --user=ravi --password=xxx addressdb