What are the mysql database types? How to choose the appropriate data type

The following factors need to be considered when selecting MySQL data types: data range, constraints, storage space, query performance. MySQL data types are divided into: Numeric types: TINYINT, INT, etc. Date and time types: DATE, DATETIME, etc. Character types: CHAR, VARCHAR, etc. Binary types: BINARY, VARBINARY, etc. Special types: ENUM, SET, etc.

MySQL database type

MySQL is a powerful relational database management system that provides a variety of data types for different types of data . Different data types lend themselves to different data scopes, constraints, and storage requirements.

How to choose the appropriate data type

Choosing the appropriate data type is crucial to ensuring data integrity, optimizing storage space, and improving query performance. The following are important factors to consider when choosing a data type:

• Data range: Choose a type that can accommodate the maximum value expected for the data type. For example, for storing large numbers of integers, the BIGINT type is more appropriate than the INT type.
• Constraints: Consider constraints on the data type, such as allowed number ranges, character length, or nullability. Constraints help ensure data accuracy and consistency.
• Storage space: Larger data types require more storage space. When choosing a data type, it's important to strike a balance between storage space and performance.
• Query performance: Some data types are better suited for specific query types than others. For example, using integer types for index columns can improve the performance of range queries.

MySQL data types

MySQL provides various data types, which can be divided into the following categories:

• Numeric types: TINYINT, SMALLINT, INT, BIGINT, DECIMAL, FLOAT, DOUBLE, etc.
• Date and time types: DATE, TIME, DATETIME, TIMESTAMP, etc.
• Character type: CHAR, VARCHAR, TEXT, BLOB, etc.
• Binary type: BINARY, VARBINARY, IMAGE, LONGBLOB, etc.
• Special types: ENUM, SET, JSON, etc.

Example

• To store user IDs you can use the INT type because it is an integer with a limited range.
• You can use the VARCHAR(255) type to store user names because it is a variable-length string.
• You can use the DATE type to store the user's date of birth, because it only stores date information.
• The BLOB type can be used to store user photos because it is a binary object.

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