Working with Database
Create a database with a specified name if it does not exist in database server
CREATE DATABASE [IF NOT EXISTS] database_name
Use database or change current database to another database you are working with
USE database_name
Drop a database with specified name permanently. All physical file associated with the database is no longer exists.
DROP DATABASE [IF EXISTS] database_name
Show all available databases in database server
SHOW DATABASES
Working with Table
Lists all tables in a database.
SHOW TABLES
Create table statement defines the structure of table in a database.
CREATE [TEMPORARY] TABLE [IF NOT EXISTS] table_name (create_clause ,...) [table_options] [[IGNORE|REPLACE] select]
Altering table structure
ALTER [IGNORE] TABLE table_name actions
Actions can be one of the following actions:
ADD [COLUMN]
Add a new column into a table
DROP [COLUMN]
Drop an existing column in a table
ADD INDEX [name](column_name, ...)
Add index with a specific name to a table on a column
DROP INDEX index_name Drop an index from a table
ADD PRIMARY KEY (column_name,…)
Add primary key into a tables
DROP PRIMARY KEY
Drop primary key from a table
Deleting table permanently
DROP TABLE [IF EXISTS] table_name [, name2, ...] [RESTRICT | CASCADE]
Give information about the table or column.
DESCRIBE table [column_name] DESC table [column_name]
Working with Index
Creating an index with the specified name on a table
CREATE [UNIQUE|FULLTEXT] INDEX index_name ON table (column_name,...)
Removing a specified index from table
DROP INDEX index_name
Retrieving Data
Retrieving complete data in a database table
SELECT * FROM table_name
Retrieving specified data which is shown in the column list from a database table
SELECT column_name, column_name2…. FROM table_name
Retrieving unique records
SELECT DISTINCT (column_name) FROM table_name
Retrieving data from multiples table using join
SELECT * FROM table_name1 INNER JOIN table_name2 ON conditions
SELECT * FROM table_name1 LEFT JOIN table_name2 ON conditions
SELECT *
FROM table_name1
RIGHT JOIN table_name2 ON conditions
Counting number of rows in a database table
SELECT COUNT (*) FROM table_name
Sorting ascending or descending retrieved data based on one or more column
SELECT column_name, column_name2…. FROM table_name ORDER BY column_name ASC [DESC], column_name2 ASC [DESC],
Group the retrieved rows data
SELECT * FROM table_name GROUP BY column_name
Matching Data based on a pattern
Matching data using LIKE operator
SELECT * FROM table_name WHERE column_name LIKE ‘%value%’
Matching data using regular expression
SELECT * FROM table_name WHERE column_name RLIKE ‘regular_expression’  Mark BSc Honours in Computer Science Software Architect / Developer Mobile 079 9111 855 Email info@mydeveloper.co.za