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
