Should we use enum in MySQL?

MySQL ENUM data type contains the following advantages: Compact data storage where the column may have a limited set of specified possible values. Here, the string values automatically used as a numeric index. It allows readable queries and output because the numbers can be translated again to the corresponding string.

Should you use enum in SQL?

Enum types are more convenient for coding. For infrequent releases, or if you often have new/deleted/changed values, use a database table. For static sets of values, or if you release code all the time, use an enum.

Should I use enum in database?

What is the purpose of enum?

Enumerations offer an easy way to work with sets of related constants. An enumeration, or Enum , is a symbolic name for a set of values. Enumerations are treated as data types, and you can use them to create sets of constants for use with variables and properties.

How is an enum type used in Table Creation?

An ENUM is a string object with a value chosen from a list of permitted values that are enumerated explicitly in the column specification at table creation time. See Section 11.3.1, “String Data Type Syntax” for ENUM type syntax and length limits. The ENUM type has these advantages:

What are the advantages of using enum in MySQL?

A string representation of what the value means. That’s it, as far as I’m concerned. How valuable that is depends on your application. I find ENUM is a short form definition of a code table. Its main advantage is that it avoids the code required to join and show the code description. It also eases setting the values if they arrive in string form.

Which is better, an int or an enum?

Lets say in some random table, you have a column named status. It’s real-world values would be either enabled or disabled. Is it better for this column’s data type to be an int/bool (1 or zero) or to use ENUM with the values being enabled and disabled? What are the advantages or disadvantages?

How are enum values sorted in MySQL column?

ENUM values are sorted based on their index numbers, which depend on the order in which the enumeration members were listed in the column specification. For example, ‘b’ sorts before ‘a’ for ENUM(‘b’, ‘a’).

Should we use ENUM in MySQL?

MySQL ENUM data type contains the following advantages: Compact data storage where the column may have a limited set of specified possible values. Here, the string values automatically used as a numeric index. It allows readable queries and output because the numbers can be translated again to the corresponding string.

Should I use SQL ENUM?

For static sets of values, or if you release code all the time, use an enum. Enum is good when: You want to limit the choice of possible values (e.g. days of the week, sex (male/female) ) You want to reduce storage space (tuples are stored in just 1 byte each)

Is MySQL ENUM bad?

ENUM is great for data that you know will fall within a static set. If you are using Mysql 5+, storage is almost always better with an ENUM type for data in a static set, as the official MySQL reference shows. Not to mention that the data is readable, and you have an extra layer of validation.

What are the advantages of using an ENUM over an int?

they increase the level of abstraction since you immediately see what underlying integral values represent. You can use them instead of magic numbers and by doing that making the code more understandable.

Why is ENUM not good?

Drawback of using ENUM Each value in an ENUM is an object and each declaration will take some runtime memory simply to reference the object. So ENUM values will take more memory then Integer or String constant.

Why is ENUM bad?

The problem with enums is described in Fowler’s Refactoring, where it is considered a code smell. It has nothing to do with type safety, but rather that it forces you to sprinkle switch statements all over your code, thus violating the DRY Principle.

Why should I use enum?

Enums are lists of constants. When you need a predefined list of values which do represent some kind of numeric or textual data, you should use an enum. You should always use enums when a variable (especially a method parameter) can only take one out of a small set of possible values.

Is the enum type the same as an int?

I’m going to assume you meant a tinyint (instead of int). So, on the surface, they’re all the same. ENUM does take up some metadata for the string value associated with it though ( older src) I would say as you add more values though, any advantage starts to swing away from ENUM.

How many bytes does an enum take in MySQL?

I’m going to assume you meant a tinyint (instead of int). ENUM takes 1 byte (if under 255 values) or 2 bytes (up to maximum of 65,535. TinyInt takes 1 byte (maximum of 255 values) Boolean is a synonym for TinyInt.

What are the advantages and disadvantages of using enum?

ENUM does take up some metadata for the string value associated with it though ( older src) I would say as you add more values though, any advantage starts to swing away from ENUM. Especially if you add the values after the table is already in use, because you have to alter the table structure to accommodate.

Which is enum corresponds to a SQL Server Time value?

Corresponds to a SQL Server time value. Array of type Byte. Automatically generated binary numbers, which are guaranteed to be unique within a database. timestamp is used typically as a mechanism for version-stamping table rows. The storage size is 8 bytes. Byte. An 8-bit unsigned integer. A SQL Server user-defined type (UDT). Guid.