List of MySQL Handy Commands
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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