First where your mysql is
which mysql
To login (from unix shell) use -h only if needed.
mysql -u root -p
or
[mysql dir]/bin/mysql -h hostname -u username -p
// on Mac MAMP:
/Applications/MAMP/Library/bin/mysql -u root -p
To login (from windows)
mysql dir/bin/mysql.exe -h hostname -u username -ppassword
Creating a new user. Login as root. Switch to the MySQL db. Make the user. Update privs.
# mysql -u root -p
mysql> use mysql;
mysql> INSERT INTO user (Host,User,Password) VALUES('%','username',PASSWORD('password'));
mysql> flush privileges;
Change a users password from unix shell.
# [mysql dir]/bin/mysqladmin -u username -h hostname -ppassword 'new-password'
Change a users password from MySQL prompt. Login as root. Set the password. Update privileges.
mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('password');
mysql> flush privileges;
Recover a MySQL root password. Stop the MySQL server process. Start again with no grant tables. Login to MySQL as root. Set new password. Exit MySQL and restart MySQL server.
# /etc/init.d/mysql stop
# mysqld_safe --skip-grant-tables
# mysql -u root
mysql> use mysql;
mysql> update user set password=PASSWORD("newpassword") where User='root';
mysql> flush privileges;
mysql> quit
# /etc/init.d/mysql stop
# /etc/init.d/mysql start
Set a root password if there is no root password.
# mysqladmin -u root password newpassword
Update a root password.
# mysqladmin -u root -p oldpassword newpassword
Allow the user "Someone" to connect to the server from localhost using the password "passwd". Login as root. Switch to the MySQL db. Give privs. Update privs.
> mysql -u root -p
mysql> use mysql;
mysql> grant usage on *.* to Someone@localhost identified by 'passwd';
mysql> flush privileges;
Give user privilages for a db. Login as root. Switch to the MySQL db. Grant privs. Update privs.
# mysql -u root -p
mysql> use mysql;
mysql>INSERT INTO user(Host,Db,User,Select_priv,Insert_priv,Update_priv,Delete_priv,Create_priv,Drop_priv)
VALUES ('%','databasename','username','Y','Y','Y','Y','Y','N');
mysql> flush privileges;
or
mysql> grant all privileges on databasename.* to username@localhost;
mysql> flush privileges;
Create a database.
mysql> create database [databasename];
List all databases on the server.
mysql> show databases;
To delete a db.
mysql> drop database [database name];
Switch to a database.
mysql> use [db name];
To see all the tables in the db.
mysql> show tables;
To see table's field formats.
mysql> describe [table name];
To delete a table.
mysql> drop table [table name];
Show all data from a table.
mysql> SELECT * FROM [table name];
To return columns and column information.
mysql> show columns from [table name];
Show particular rows with the given value.
mysql> SELECT * FROM [table name] WHERE [field name] = "value";
Show all records containing the name "Something" AND the phone number '0123456789'.
mysql> SELECT * FROM [table name] WHERE name = "Something" AND phone_number = '0123456789';
Show all records not containing the name "Something" AND the phone number '0123456789' order by the phone_number field.
mysql> SELECT * FROM [table name] WHERE name != "Something" AND phone_number = '0123456789' order by phone_number;
Show all records starting with the letters 'Something' AND the phone number '0123456789'.
mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789';
Show all records starting with letters 'Something' AND the phone number '0123456789' limit to records 1 through 5.
mysql> SELECT * FROM [table name] WHERE name like "Something%" AND phone_number = '0123456789' 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] = 'fieldvalue';
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.
ysql> 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];
Load a CSV file into a table.
mysql> 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.
# mysqldump -u username -ppassword --opt > /tmp/alldatabases.sql
Dump one database for backup.
# mysqldump -u username -ppassword --databases databasename > /tmp/databasename.sql
Dump a table from a database.
# mysqldump -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql
Restore database (or database table) from backup.
# mysql -u username -ppassword databasename < /tmp/databasename.sql
Create Table Example 1:
mysql> CREATE TABLE [table name] (name VARCHAR(20));
Create Table Example 2 w/ multiple rows:
mysql> CREATE TABLE User (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,firstName VARCHAR(35) NOT NULL,lastName VARCHAR(50) NOT NULL,username VARCHAR(50) NOT NULL,HASH VARCHAR(50) NOT NULL);
CREATE TABLE SystemUsers (userId INT NOT NULL AUTO_INCREMENT PRIMARY KEY, email VARCHAR(100) NOT NULL, password VARCHAR(100) NOT NULL,firstName VARCHAR(100) NOT NULL, lastName VARCHAR(100) NULL, verifyToken VARCHAR(100) NULL, isEmailVerified BIT NULL, resetPwdToken VARCHAR(100) NULL, resetPwdExpiry DATETIME NULL, systemRole VARCHAR(20) NULL);
and so on...