mySQL
To login.(from unix shell): [mysql dir]/bin/mysql -u root -p
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];
Show certain selected rows: SELECT * FROM [table] WHERE [column] ="whatever";
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]Host,User,Password)VALUES('%','user',PASSWORD('password'));
Change a users password.(from unix shell): [mysql dir]/bin/mysqladmin -u root -h dc1-srv-sql-01 -p password 'new-password'
Switch to mysql db.Give user privilages for a db: INSERT INTO [table](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 db: UPDATE [table] SET Select_priv = 'Y',Insert_priv = 'Y',Update_priv = 'Y' where [columnname] = 'user';
Delete a record from the db: DELETE from [table] where [columnname] = 'whatever';
Update database permissions/privilages: FLUSH PRIVILEGES;
Delete a column: alter table met_user_info drop column [columnname];
Add a new column to db: alter table [tablename] add column [newcolumnname] varchar (20);
Change column name: alter table [tablename] change [oldcolumnname] [newcolumnname] varchar (50);
Make a unique column so you get no dupes: alter table [tablename] add unique ([columnname]);
Make a column bigger: alter table [tablename] modify [columnname] VARCHAR(3);
Delete unique from table: alter table [tablename] drop index [colmnname];
Load a CSV file into a table: LOAD DATA INFILE '/tmp/filename.csv' replace INTO TABLE [tablename] 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 --user=root --password=blah --all-databases > /tmp/sql-01_backup.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');
