The "Noob Link" Technical Reference
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Handy MySQL Commands
DescriptionCommand
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];
Show all data in a table:SELECT * FROM [table name];
Returns the columns and column information pertaining to the designated table:show columns from [table name];
Show certain selected rows: 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';
Join tables on common columnsselect 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'
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 1CREATE 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 2create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastname varchar(50) default 'bato');