List of Handy MySQL Commands

List of MySQL Handy Commands

mysql

mysql

Description Command
To login.(from unix shell): [mysql dir]/bin/mysql -u root –p
List all databases on the sql server: show databases;
Switch to a database: use [db name];
To see all the tables in the db: show tables;
To see database’s field formats: describe [table name];
To delete a db: –drop-database [database name];
To delete a table: -drop table [table name];
Returns the columns and column information pertaining to the designated table: show columns from [table name];
Join tables on common columns select lookup.illustrationid,  lookup.personid, person.birthday
from lookup left join person on lookup.personid = person.personid = statement to join birthday in person table with primary illustration id;
Switch to the mysql db. Create a new user: INSERT INTO [table name] (Host, User, Password)  VALUES (‘%’, ‘user’, PASSWORD(‘password’));
Switch to mysql db.Give user privilages for a db: INSERT INTO [table name] (Host, Db, User, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv) VALUES  (‘%’, ‘db’, ‘user’, ‘Y’, ‘Y’, ‘Y’, ‘Y’, ‘Y’, ‘N’);
Update database permissions/privilages: FLUSH PRIVILEGES;
Delete a column: alter table [table name] –drop column [column name];
Add a new column to db: alter table [table name] add column [new column name] varchar (20);
Change column name: alter table [table name] change [old column name] [new column name] varchar (50);
Make a unique column so you get no dupes: alter table [table name] add unique ([column name]);
Make a column bigger: alter table [table name] modify [column name] VARCHAR(3);
Delete unique from table: alter table [table name] –drop index [colmn name];
Load a CSV file into a table: LOAD DATA INFILE ‘/tmp/filename.csv’ replace INTO TABLE [table name] FIELDS TERMINATED BY ‘,’ LINES TERMINATED BY ‘\n’ (field1, field2, field3);
Dump all databases for backup.Backup file is sql commands to recreate all db’s. [mysql dir]/bin/mysqldump –user=root –password=blah –all-databases >/tmp/sql-01_backup.sql
Create Table Example 1 CREATE TABLE [table name] (firstname VARCHAR(20),  middleinitial VARCHAR(3), lastname VARCHAR(35), suffix VARCHAR(3), officeid VARCHAR(10), userid VARCHAR(15), username VARCHAR(8), email VARCHAR(35), phone VARCHAR(25),  groups VARCHAR(15),  datestamp DATE,  timestamp time, pgpemail  VARCHAR(255));
Create Table Example 2 create table [table name] (personid int(50) not null auto_increment primary key, firstname varchar(35), middlename  varchar(50), lastname varchar(50) default  ‘bato’);

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