MySQL Examples

Practical MySQL database examples, queries, and demonstrations for database development and management.

MySQL SELECT

SELECT Column SELECT * SELECT DISTINCT SELECT COUNT(DISTINCT column_name)

MySQL WHERE

WHERE Clause Text Fields vs. Numeric Fields

MySQL AND, OR and NOT

AND OR Another OR NOT Combining AND and OR Combining AND and NOT

MySQL ORDER BY

ORDER BY ORDER BY DESC ORDER BY Several Columns ORDER BY Several Columns + ASC and DESC

MySQL NULL Values

IS NULL Operator IS NOT NULL Operator

MySQL LIMIT

LIMIT LIMIT with WHERE

MySQL MIN() and MAX()

MIN() MAX()

MySQL COUNT(), AVG() and SUM()

COUNT() AVG() SUM()

MySQL LIKE

Select all table rows starting with "a" Select all table rows ending with "a" Select all table rows that have "or" in any position Select all table rows that have "r" in the second position Select all table rows that starts with "a" and ends with "o" Select all table rows that starts with "a" and are at least 3 characters in length Select all table rows that does NOT start with "a"

MySQL Wildcards

The % Wildcard The _ Wildcard

MySQL IN

IN NOT IN IN with SELECT

MySQL BETWEEN

BETWEEN NOT BETWEEN BETWEEN with IN BETWEEN Text Values NOT BETWEEN Text Values BETWEEN Date Values

MySQL Aliases

Alias for Columns Two Aliases An Alias that contains multiple columns Alias for Tables

MySQL Joins

INNER JOIN - Join two tables INNER JOIN - Join three tables LEFT JOIN RIGHT JOIN CROSS JOIN Self Join

MySQL UNION

UNION UNION ALL UNION with WHERE UNION ALL with WHERE

MySQL GROUP BY

GROUP BY GROUP BY and ORDER BY GROUP BY with JOIN

MySQL HAVING

HAVING and GROUP BY HAVING and ORDER BY HAVING and WHERE

MySQL EXISTS

EXISTS - Price less than 20 EXISTS - Price equals 20

MySQL ANY and ALL

ANY - Example 1 ANY - Example 2 ANY - Example 3 ALL - Example 1 ALL - Example 2

MySQL CASE

CASE 1 CASE 2

MySQL Comments

Single line Comment Single line comment at the end of a line Single line comments to ignore statement Multi line comment Multi line comment to ignore many statement

MySQL Database

MySQL Create DB MySQL Drop DB MySQL Create Table MySQL Drop Table MySQL Alter Table MySQL Constraints MySQL Not Null MySQL Unique MySQL Primary Key MySQL Foreign Key MySQL Check MySQL Default MySQL Create Index MySQL Auto Increment MySQL Dates MySQL Views