CREATE TABLE quantum ( id bigint (20) NOT NULL AUTOINCREMENT, type enum ('a','b','c','d','e') CHARACTER SET latin1 NOT NULL, PRIMARY KEY (id) ) ENGINEMyISAM AUTOINCREMENT11173 DEFAULT CHARSETutf8. I'm using MySQL Workbench 6.3 for my database. For more reference, check the official documentation of MySQL. As the title suggests, i'm trying to add more elements to my existing ENUM-type column.

How Does MySQL ENUM Works Let us see where the ENUM is usually defined in MySQL. It has readable queries, which makes it a readable query and output.

), which represent the string values because of which it has compact data storage. Thanks for reading! We’ve studied MySQL ENUM data type and how it is implemented. MySQL ENUM uses numeric indexes (1, 2, 3. It is simple to use and efficient, making it a good choice for many applications. 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. In conclusion, MySQL ENUM is a powerful data type that can be used to store a limited set of values. Takes precedence to ‘ascii’ or ‘unicode’ short-hand. charset Optional, a column-level character set for this string value. To get the complete enumeration list, one needs to access the information_schema database. Changed in version The: MySQL ENUM type as well as the base Enum type now validates all Python data values.You can not use another table as a priority list.ENUM is not SQL standard and only some database systems support it which as a result proves to be difficult when porting to RDBMS.If we want to change the enumeration of the list, then we have to recreate the whole table which proves to be expensive in terms of time.It reduces errors that are caused by mistyping the numbers.Order By priority DESC Code language: SQL (Structured Query Language) ( sql ) Sorting ENUM 2 Advantages of ENUM in MySQL For Descending order- Select name, priority From The values are sorted in ascending order by default. We’ll use the ORDER BY clause to sort enum values in MySQL- Select name, priority From The ENUM values are based on the index number and therefore the order of those values will depend on how they were defined in the list. Output- ENUM 2 How to Sort MySQL ENUM Values

In particular, one use case is worth exploring: polymorphic associations.Code language: SQL (Structured Query Language) ( sql )

Without an index on myenum, the query took around 50 seconds to complete. Having said that, while the points raised by the article are valid, ultimately, I take ENUM as a tool: unless it implicitly promotes for bad design (a famous example being Visual Basic 6, with lack of separation of concerns and On Error Resume Next), I’m neutral toward a tool in itself. SELECT FROM mytable WHERE myenum IN ('a', 'b') ORDER BY id DESC LIMIT 0, 100 The id column is the primary key. When searching for ENUM, one of the top articles is 8 Reasons Why MySQL’s ENUM Data Type Is Evil.īefore talking about it, it’s crucial to know that one of the points (#2) is partially obsolete - in modern MySQL versions, adding an entry to the set does not require a table rebuild. They explore different use cases and outcomes.

Using the ENUM data type to increase performance.

Enum Fields VS Varchar VS Int + Joined table: What is Faster?.

There are a couple of articles on performance: It’s always important to be aware that any performance consideration should always be measured - if performance is the target - as such improvement may be negligible.

comparing integers is computationally faster than comparing strings.

In addition to the space saved, there is a performance improvement in related indexes scanning due to:

Enum type mysql