Enum mysql example how to#
Enum mysql example full#
Enum mysql example code#
Enum mysql example plus#

If you find this article useful, do consider sharing it on Google Plus and Facebook. If you know more about ENUM and SET in MySQL, do let me know via comments. See All SQL Examples MySQL Quiz Test Test your MySQL skills at W3Schools Start MySQL Quiz My Learning Track your progress with the free 'My Learning' program here at W3Schools.

Enum mysql example code#

Sometimes its increase the complexity of program code and complicated to maintain database. Start the Exercise MySQL Examples Learn by examples This tutorial supplements all explanations with clarifying examples.

The storage limits for ENUM types is 65535 possible values in the list and also a SET can allow upto 64 distinct values which are the chosen values in the set.

We need more values then we need to change the list of possible values from the database which is more difficult for non programmers.

MySQL itself refuses value which is not included in the list.Įven after seeing benefits, I am suggesting not to use ENUM and SET types because of the following reasons:

Instead of storing the whole value, MySQL stores only an integer values which use one or two bytes depending on the number of values in the list Now Let’s see the benefits of such types: When a field is defined as ENUM or SET, we are using Data edit panels to store fixed data which provided by PHPMyAdmin and values will be displayed in a drop-down e in below screen It is a column that can take the value from the list of values that are enumerated explicitly in the column specification when creating table field.

Enum mysql example how to#

How to set Enum in MySQLĪn Enumeration is known as ENUM.

Enum mysql example full#

The difference between SET and ENUM is that SET column can contain multiple values and whereas an ENUM can hold only one of the possible values.The SET type is similar to ENUM whereas the SET type is stored as a full value rather than an index of a value as with ENUM. Both ENUM and SET types allow us to specify a list of possible values for a column with a default value.When defining an ENUM, we are creating a list of items from which the value must be selected or it can be NULL. MySQL supports various data types which we can use as per requirement or data.MySQL provides two data types ENUM and SET types. ENUM and SET types are the special string types in which values are chosen from the fixed list of values set in the database table. OK gamerating may be a bad example since ESRB could create more game ratings. With ENUM you get same storage efficiency (or even better) than SMALLINT, but the ease of use of a VARCHAR data type.ENUM and SET are the most controversial types provided by MySQL. you can allow for NULL (Example : gamerating ENUM ('EC','E','E10+','T','M','A') NULL This allows a new game to be entered into a table without a default rating) CAVEAT. This is where ENUM makes sense: CREATE TABLE country_continent (Ĭontinent ENUM('Africa', 'America', 'Antarctica', 'Asia', 'Europe', 'Oceania') INSERT INTO country_continent VALUES ('Paris', 3) INSERT INTO country_continent VALUES ('New-York', 2) INSERT INTO country_continent VALUES ('Kenya', 1) INSERT INTO continents VALUES (3, 'Europe') INSERT INTO continents VALUES (2, 'America') INSERT INTO continents VALUES (1, 'Africa') INSERT INTO country_continent VALUES ('Paris', 'Europe') įor better storage efficiency you'd better use SMALLINT (2 bytes) instead of VARCHAR (generally 1 byte + the Length of the string) for the continent field: CREATE TABLE continents (

INSERT INTO country_continent VALUES ('New-York', 'America')

INSERT INTO country_continent VALUES ('Kenya', 'Africa') It's real-world values would be either enabled or disabled. Using VARCHAR CREATE TABLE country_continent ( 146 Lets say in some random table, you have a column named status. Let's take your example with a table listing the countries and their respective continents. ENUM datatype can be seen as a 'human-readable' numeric value, commonly used for convenience and data storage efficiency.