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What is the MySQL ENUM data type? What are the advantages of using the ENUM data type?

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2023-08-26 23:13:081470browse

MySQL ENUM 数据类型是什么?使用 ENUM 数据类型有哪些优点?

#The ENUM data type differs from the standard data type in that it is an enumerated list containing 1 to 65,535 strings that represent the allowed values ​​of the field. When you define an ENUM, you are creating a list of items from which a value must be selected (or can be NULL).

For example, if you want a field to contain "A" or "B" or "C", you can define ENUM as ENUM('A', 'B', 'C') with only these values ​​( or NULL) to populate this field.

Perhaps the following are some advantages of the ENUM data type:

  • Compact data storage can be observed in situations where a column has a limited set of possible values.
  • The specified string as the input value is automatically encoded as a number.
  • Numbers are converted back to corresponding strings in query results.
  • By using ENUM, we can get readable queries and output.

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