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MySQL Cheat Sheet

MySQL cheat sheet provides the most commonly used MySQL statements that help you practice MySQL more effectively.

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 the MySQL database server

SHOW DATABASES

Working with Table

Lists all tables in a database.

SHOW TABLES

Create table statement that defines the structure of table .

CREATE [TEMPORARY] TABLE [IF NOT EXISTS] table_name(
   key type(size) NOT NULL PRIMARY KEY AUTO_INCREMENT,
   c1 type(size) NOT NULL,
   c2 type(size) NULL,
   ...
) Engine= [InnoDB|MyISAM]|...]

Altering table structure

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 into a tables

ADD PRIMARY KEY (column_name,...)

Remove primary key from a table

DROP PRIMARY KEY

Deleting table permanently

 DROP TABLE [IF EXISTS] table_name [, name2, ...]
 [RESTRICT | CASCADE]

Get 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

Querying Data

Query complete data in a database table

SELECT * FROM table_name

Query specified data which is shown in the column list from a database table

SELECT column_name, column_name2….
FROM table_name

Query unique records

SELECT DISTINCT (column_name)
FROM table_name

Query 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

Counting number of rows in a database table

SELECT COUNT (*)
FROM table_name

Sorting ascending or descending based on one or more columns:

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'