Browsing

SHOW DATABASES
SHOW TABLES
SHOW FIELDS FROM table / DESCRIBE table
SHOW CREATE TABLE table
SHOW PROCESSLIST
KILL process_number

Select

SELECT {*} FROM table
SELECT {*} FROM table1, table2, ...
SELECT field1, field2, ... FROM table1, table2, ...
SELECT ... FROM ... WHERE condition
SELECT ... FROM ... WHERE condition GROUPBY field
SELECT ... FROM ... WHERE condition GROUPBY field HAVING condition2
SELECT ... FROM ... WHERE condition ORDER BY field1, field2
SELECT ... FROM ... WHERE condition ORDER BY field1, field2 DESC
SELECT ... FROM ... WHERE condition LIMIT 10
SELECT DISTINCT field1 FROM ...
SELECT DISTINCT field1, field2 FROM ...

Insert

INSERT INTO table1 (field1, field2, ...) VALUES (value1, value2, ...)

Update

UPDATE table1 SET field1=new_value1 WHERE condition
UPDATE table1, table2 SET field1=new_value1, field2=new_value2, ... WHERE table1.id1 = table2.id2 AND condition

Join

SELECT ... FROM t1 JOIN t2 ON t1.id1 = t2.id2 WHERE condition
SELECT ... FROM t1 LEFT JOIN t2 ON t1.id1 = t2.id2 WHERE condition
SELECT ... FROM t1 JOIN (t2 JOIN t3 ON ...) ON ...

Delete

DELETE FROM table1 / TRUNCATE table1
DELETE FROM table1 WHERE condition
DELETE FROM table1, table2 FROM table1, table2 WHERE table1.id1 = table2.id2 AND condition

Conditions

field1 = value1
field1 <> value1
field1 LIKE 'value _ %'
field1 IS NULL
field1 IS NOT NULL
field1 IS IN (value1, value2)
field1 IS NOT IN (value1, value2)
condition1 AND condition2
Insert condition1 OR condition2

Users and Privileges

GRANT ALL PRIVILEGES ON base.{*} TO 'user'@'localhost' IDENTIFIED BY 'password';
GRANT SELECT, INSERT, DELETE ON base.{*} TO 'user'@'localhost' IDENTIFIED BY 'password';
REVOKE ALL PRIVILEGES ON base.{*} FROM 'user'@'host'; - one permission only
REVOKE ALL PRIVILEGES, GRANT OPTION FROM 'user'@'host'; - all permissions
SET PASSWORD = PASSWORD('new_pass')
SET PASSWORD FOR 'user'@'host' = PASSWORD('new_pass')
SET PASSWORD = OLD_PASSWORD('new_pass')
DROP USER 'user'@'host'

host ‘%’ indicates any host.

Create/Delete Database

CREATE DATABASE mabase
CREATE DATABASE mabase CHARACTER SET utf8
DROP DATABASE mabase
ALTER DATABASE mabase CHARACTER SET utf8

Create/Delete Table

CREATE TABLE table (field1 type1, field2 type2, ...)
CREATE TABLE table (field1 type1, field2 type2, ..., INDEX (field))
CREATE TABLE table (field1 type1, field2 type2, ..., PRIMARY KEY (field1))
CREATE TABLE table (field1 type1, field2 type2, ..., PRIMARY KEY (field1,field2))
CREATE TABLE table IF NOT EXISTS (...)
CREATE TEMPORARY TABLE table (...)
DROP TABLE table
DROP TABLE IF EXISTS table
DROP TABLE table1, table2, ...
ALTER TABLE table MODIFY field1 type1
ALTER TABLE table MODIFY field1 type1 NOT NULL ...
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 NOT NULL ...
ALTER TABLE table ALTER field1 SET DEFAULT ...
ALTER TABLE table ALTER field1 DROP DEFAULT
ALTER TABLE table ADD new_name_field1 type1
ALTER TABLE table ADD new_name_field1 type1 FIRST
ALTER TABLE table ADD new_name_field1 type1 AFTER another_field
ALTER TABLE table DROP field1
ALTER TABLE table ADD INDEX (field);

Change field order

ALTER TABLE table MODIFY field1 type1 FIRST
ALTER TABLE table MODIFY field1 type1 AFTER another_field
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 FIRST
ALTER TABLE table CHANGE old_name_field1 new_name_field1 type1 AFTER another_field

Miscellany

Backup Database to SQL File

mysqldump -u Username -p Database > databasename_backup.sql

Restore from backup SQL File

mysql - u Username -p Database < databasename_backup.sql

Reset Root Password

/etc/init.d/mysql stop

mysqld_safe --skip-grant-tables

on another terminal

mysql

mysql> UPDATE mysql.user SET password=PASSWORD('new_pass') WHERE user='root';

Switch back to the mysqld_safe terminal and kill the process using Control + \

/etc/init.d/mysql start

Repair Tables After Unclean Shutdown

mysqlcheck -all-databases

mysqlcheck -all-databases -fast