Mysql command line commands - Linux

To login from linux command prompt

#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 "rao"

mysql> SELECT * FROM [table name] WHERE [field name] = "rao";

Show all records containing the name "rao" AND the phone number '98467258'.

mysql> SELECT * FROM [table name] WHERE name = "rao" AND phone_number = '98467258';

Show all records not containing the name "rao" AND the phone number '98467258' order by the phone_number field.

mysql> SELECT * FROM [table name] WHERE name != "rao" AND phone_number = '98467258' 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];

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