MySQL Commands

MySQL 8.0 commands 

Description Command
To login (from unix shell) use -h only if needed. [mysql dir]/bin/mysql -h hostname -u root -p
Create a database on the sql server CREATE DATABASE testdb;
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 with the value "whatever" SELECT * FROM [table name] WHERE [field name] = "whatever";
Show all records containing the name "Adam" AND the phone number '11122233' SELECT * FROM [table name] WHERE name = "Adam" AND phone_number = '11122233';
Show all records not containing the name "Adam AND the phone number '11122233' order by the phone_number field SELECT * FROM [table name] WHERE name != "Adam" AND phone_number = '11122233' order by phone_number;
Show all records starting with the letters 'bob' AND the phone number '11122233' SELECT * FROM [table name] WHERE name like "Bob%" AND phone_number = '11122233';
Use a regular expression to find records. Use "REGEXP BINARY" to force case-sensitivity. This finds any record beginning with a SELECT * FROM [table name] WHERE rec RLIKE "^a$";
Show unique records SELECT DISTINCT [column name] FROM [table name];
Show selected records sorted in an ascending (asc) or descending (desc) SELECT [col1],[col2] FROM [table name] ORDER BY [col2] DESC;
Count rows SELECT COUNT(*) FROM [table name];
Join tables on common columns 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;
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 -p password 'new-password'
Change a users password.(from MySQL prompt) SET PASSWORD FOR 'user'@'hostname' = PASSWORD('passwordhere');
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 -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 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 create table [table name] (personid int(50) not null auto_increment primary key,firstname varchar(35),middlename varchar(50),lastname varchar(50) default 'bato');