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- #restore .sql file to the database
- mysql target-db-name < sql-file-name.sql -uuser -p
- # [mysql dir]/bin/mysql -h hostname -u root -p
- Create a database on the sql server.
- mysql> create database [databasename];
- List all databases on the sql server.
- mysql> show databases;
- Switch to a database.
- mysql> use [db name];
- To see all the tables in the db.
- mysql> show tables;
- To see database's field formats.
- mysql> describe [table name];
- To delete a db.
- mysql> drop database [database name];
- To delete a table.
- mysql> drop table [table name];
- Show all data in a table.
- mysql> SELECT * FROM [table name];
- Returns the columns and column information pertaining to the designated table.
- mysql> show columns from [table name];
- Show certain selected rows with the value "whatever".
- mysql> SELECT * FROM [table name] WHERE [field name] = "whatever";
- Show all records containing the name "Bob" AND the phone number '3444444'.
- mysql> 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.
- mysql> 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'.
- mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444';
- Show all records starting with the letters 'bob' AND the phone number '3444444' limit to records 1 through 5.
- mysql> SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '3444444' 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];
- Join tables on common columns.
- mysql> 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;
- 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.blah.org -p password 'new-password'
- Change a users password from MySQL prompt. Login as root. Set the password. Update privs.
- # mysql -u root -p
- mysql> SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
- 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("newrootpassword") 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 on root password.
- # mysqladmin -u root password newpassword
- Update a root password.
- # mysqladmin -u root -p oldpassword newpassword
- Allow the user "bob" 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 bob@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 db (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;
- 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] = 'whatever';
- 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.
- mysql> 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.
- # [mysql dir]/bin/mysqldump -u root -ppassword --opt >/tmp/alldatabases.sql
- Dump one database for backup.
- # [mysql dir]/bin/mysqldump -u username -ppassword --databases databasename >/tmp/databasename.sql
- Dump a table from a database.
- # [mysql dir]/bin/mysqldump -c -u username -ppassword databasename tablename > /tmp/databasename.tablename.sql
- Restore database (or database table) from backup.
- # [mysql dir]/bin/mysql -u username -ppassword databasename < /tmp/databasename.sql
- Create Table Example 1.
- mysql> 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.
- mysql> create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastnamevarchar(50) default 'bato');
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