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Handy MySQL-Commands

DescriptionCommand
To login (from unix shell) use -h only if needed.[mysql dir]/bin/mysql -h hostname -u root -p
Create a database on the sql server.create database [databasename];
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];
Show all data in a table.SELECT * FROM [table name];
To add a user 'custom', password 'obscure', allowing him/her common tasks on database 'bankaccount.*' but only from host 'localhost'.GRANT SELECT, INSERT, UPDATE, DELETE, CREATE, DROP ON bankaccount.* TO 'custom'@'localhost' IDENTIFIED BY 'obscure';
Same, but allowing him/her all tasks on all databases and from all hosts.GRANT ALL PRIVILEGES ON *.* TO 'custom'@'%' IDENTIFIED BY 'obscure';
Returns the columns and column information pertaining to the designated table.show columns from [table name];
Show certain selected rows with the value “whatever”. SELECT * FROM [table name] WHERE [field name] = "whatever";
Show all records containing the name “Bob” AND the phone number '3444444'.SELECT * FROM [table name] WHERE name = "Bob" AND phone_number = '3444444';
Show all records not containing the name “Bob” AND the phone number '3444444' order by the phone_number field.SELECT * FROM [table name] WHERE name != "Bob" AND phone_number = '3444444' order by phone_number;
Show all records starting with the letters 'bob' AND the phone number '3444444'.SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444';
Use a regular expression to find records. Use “REGEXP BINARY” to force case-sensitivity. This finds any record beginning with a.SELECT * FROM [table name] WHERE rec RLIKE "^a$";
Show unique records.SELECT DISTINCT [column name] FROM [table name];
Show selected records sorted in an ascending (asc) or descending (desc).SELECT [col1], [col2] FROM [table name] ORDER BY [col2] DESC;
Count rows.SELECT COUNT(*) 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'));
Change a users password (from unix shell).[mysql dir]/bin/mysqladmin -u root -h hostname.blah.org -p password 'new-password'
Change a users password (from the MySQL prompt).SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
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');
To update info already in a table.UPDATE [table name] SET Select_priv = 'Y', Insert_priv = 'Y', Update_priv = 'Y' where [field name] = 'user';
Delete a row(s) from a table.DELETE from [table name] where [field name] = 'whatever';
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');
guides/mysqlcommands.txt · Last modified: 2014/04/02 22:39 (external edit)