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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<html>
<head>
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<title>MySQL Commands</title>
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<body><!-- start menu -->
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<table border="1">
<tbody>
<tr>
<td align="middle" bgcolor="#aaaaaa" colspan="2"><font size="3"><b>Handy MySQL
Commands</b></font> </td></tr>
<tr>
<td><b>Description</b></td>
<td><b>Command</b></td></tr>
<tr>
<td>To login (from unix shell) use -h only if needed.</td>
<td>[mysql dir]/bin/mysql -h hostname -u root -p</td></tr>
<tr>
<td>Create a database on the sql server.</td>
<td>create database [databasename];</td></tr>
<tr>
<td>List all databases on the sql server.</td>
<td>show databases;</td></tr>
<tr>
<td>Switch to a database.</td>
<td>use [db name];</td></tr>
<tr>
<td>To see all the tables in the db.</td>
<td>show tables;</td></tr>
<tr>
<td>To see database's field formats.</td>
<td>describe [table name];</td></tr>
<tr>
<td>To delete a db.</td>
<td>drop database [database name];</td></tr>
<tr>
<td>To delete a table.</td>
<td>drop table [table name];</td></tr>
<tr>
<td>Show all data in a table.</td>
<td>SELECT * FROM [table name];</td></tr>
<tr>
<td>Returns the columns and column information pertaining to the
designated table.</td>
<td>show columns from [table name];
</td><td>
</td></tr><tr>
</tr><tr>
<td>Show certain selected rows with the value "whatever".</td>
<td>SELECT * FROM [table name] WHERE [field name] = "whatever";
</td><td>
</td></tr><tr>
</tr><tr>
<td>Show all records containing the name "Bob" AND the phone number
'3444444'.</td>
<td>SELECT * FROM [table name] WHERE name = "Bob" AND phone_number =
'3444444';
</td><td>
</td></tr><tr>
</tr><tr>
<td>Show all records not containing the name "Bob" AND the phone number
'3444444' order by the phone_number field.</td>
<td>SELECT * FROM [table name] WHERE name != "Bob" AND phone_number =
'3444444' order by phone_number;
</td><td>
</td></tr><tr>
</tr><tr>
<td>Show all records starting with the letters 'bob' AND the phone number
'3444444'.</td>
<td>SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number =
'3444444';
</td><td>
</td></tr><tr>
</tr><tr>
<td>Use a regular expression to find records. Use "REGEXP BINARY" to force
case-sensitivity. This finds any record beginning with a. </td>
<td>SELECT * FROM [table name] WHERE rec RLIKE "^a$";
</td><td>
</td></tr><tr>
</tr><tr>
<td>Show unique records.</td>
<td>SELECT DISTINCT [column name] FROM [table name];</td></tr>
<tr>
<td>Show selected records sorted in an ascending (asc) or descending
(desc).</td>
<td>SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;</td></tr>
<tr>
<td>Count rows.</td>
<td>SELECT COUNT(*) FROM [table name];
</td><td>
</td></tr><tr>
</tr><tr>
<td>Join tables on common columns.</td>
<td>select lookup.illustrationid, lookup.personid,person.birthday from
lookup<br>left join person on lookup.personid=person.personid=statement to
join birthday in person table with primary illustration id;</td></tr>
<tr>
<td>Switch to the mysql db. Create a new user.
</td><td>INSERT INTO [table name] (Host,User,Password)
VALUES('%','user',PASSWORD('password'));</td></tr>
<tr>
<td>Change a users password.(from unix shell).</td>
<td>[mysql dir]/bin/mysqladmin -u root -h hostname.blah.org -p password
'new-password'</td></tr>
<tr>
<td>Change a users password.(from MySQL prompt).</td>
<td>SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');</td></tr>
<tr>
<td>Switch to mysql db.Give user privilages for a db.</td>
<td>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');</td></tr>
<tr>
<td>To update info already in a table.</td>
<td>UPDATE [table name] SET Select_priv = 'Y',Insert_priv =
'Y',Update_priv = 'Y' where [field name] = 'user';</td></tr>
<tr>
<td>Delete a row(s) from a table.</td>
<td>DELETE from [table name] where [field name] = 'whatever';</td></tr>
<tr>
<td>Update database permissions/privilages.</td>
<td>FLUSH PRIVILEGES;</td></tr>
<tr>
<td>Delete a column.</td>
<td>alter table [table name] drop column [column name];</td></tr>
<tr>
<td>Add a new column to db.</td>
<td>alter table [table name] add column [new column name] varchar
(20);</td></tr>
<tr>
<td>Change column name.</td>
<td>alter table [table name] change [old column name] [new column name]
varchar (50);</td></tr>
<tr>
<td>Make a unique column so you get no dupes.</td>
<td>alter table [table name] add unique ([column name]);</td></tr>
<tr>
<td>Make a column bigger.</td>
<td>alter table [table name] modify [column name] VARCHAR(3);</td></tr>
<tr>
<td>Delete unique from table.</td>
<td>alter table [table name] drop index [colmn name];</td></tr>
<tr>
<td>Load a CSV file into a table.</td>
<td>LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [table name]
FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n'
(field1,field2,field3);</td></tr>
<tr>
<td>Dump all databases for backup. Backup file is sql commands to recreate
all db's.</td>
<td>[mysql dir]/bin/mysqldump -u root -ppassword --opt
>/tmp/alldatabases.sql</td></tr>
<tr>
<td>Dump one database for backup.</td>
<td>[mysql dir]/bin/mysqldump -u username -ppassword --databases
databasename >/tmp/databasename.sql</td></tr>
<tr>
<td>Dump a table from a database.</td>
<td>[mysql dir]/bin/mysqldump -c -u username -ppassword databasename
tablename > /tmp/databasename.tablename.sql</td></tr>
<tr>
<td>Restore database (or database table) from backup.</td>
<td>[mysql dir]/bin/mysql -u username -ppassword databasename <
/tmp/databasename.sql </td></tr>
<tr>
<td>Create Table Example 1.</td>
<td>CREATE TABLE [table name] (firstname VARCHAR(20), middleinitial
VARCHAR(3), lastname VARCHAR(35),suffix VARCHAR(3),<br>officeid
VARCHAR(10),userid VARCHAR(15),username VARCHAR(8),email VARCHAR(35),phone
VARCHAR(25), groups <br>VARCHAR(15),datestamp DATE,timestamp time,pgpemail
VARCHAR(255)); </td></tr>
<tr>
<td>Create Table Example 2.</td>
<td>create table [table name] (personid int(50) not null auto_increment
primary key,firstname varchar(35),middlename varchar(50),lastname
varchar(50) default 'bato'); </td></tr></tbody></table>
</body></html>