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Handy MySQL Commands

Description Command
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];
Returns the columns and column information pertaining to the
show columns from [table name];
designated table.
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 SELECT * FROM [table name] WHERE name = "Bob" AND phone_number =
'3444444'. '3444444';
Show all records not containing the name "Bob" AND the phone number SELECT * FROM [table name] WHERE name != "Bob" AND phone_number =
'3444444' order by the phone_number field. '3444444' order by phone_number;
Show all records starting with the letters 'bob' AND the phone number SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number =
'3444444'. '3444444';
Use a regular expression to find records. Use "REGEXP BINARY" to
SELECT * FROM [table name] WHERE rec RLIKE "^a$";
force case-sensitivity. This finds any record beginning with 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];
select lookup.illustrationid, lookup.personid,person.birthday from lookup
Join tables on common columns. left join person on lookup.personid=person.personid=statement to join birthday in person
table with primary illustration id;
INSERT INTO [table name] (Host,User,Password)
Switch to the mysql db. Create a new user.
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 MySQL prompt). SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
INSERT INTO [table name]
Switch to mysql db.Give user privilages for a db. (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 [table name] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where
To update info already in a table.
[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 DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name] FIELDS
Load a CSV file into a table.
TERMINATED BY ',' LINES TERMINATED BY '\n' (field1,field2,field3);
Dump all databases for backup. Backup file is sql commands to recreate
[mysql dir]/bin/mysqldump -u root -ppassword --opt >/tmp/alldatabases.sql
all db's.
[mysql dir]/bin/mysqldump -u username -ppassword --databases databasename
Dump one database for backup.
>/tmp/databasename.sql
[mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename >
Dump a table from a database.
/tmp/databasename.tablename.sql
Restore database (or database table) from backup. [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql
CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial VARCHAR(3),
lastname VARCHAR(35),suffix VARCHAR(3),
Create Table Example 1. 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 [table name] (personid int(50) not null auto_increment primary key,firstname
Create Table Example 2.
varchar(35),middlename varchar(50),lastname varchar(50) default 'bato');