Quickly master MySQL common data types: a list of common data types and their application scenarios

MySQL is a commonly used relational database management system that provides a variety of data types to store different types of data. When using MySQL for database design and development, it is very important to understand common data types and their application scenarios. This article will introduce the commonly used data types in MySQL and provide some specific code examples to help readers better understand and use these data types.

1. Integer data type

1. TINYINT: stores integers ranging from -128 to 127, occupying 1 byte of storage space. Commonly used to store Boolean type data and small-scale counters.

Sample code:

CREATE TABLE users (

id TINYINT,
is_active TINYINT

);

2. INT: Storage range is -2147483648 to 2147483647 Integer, occupying 4 bytes of storage space. Commonly used to store integer type data such as user ID and age.

Sample code:

CREATE TABLE users (

id INT,
age INT

);

3. BIGINT: The storage range is -9223372036854775808 to 9223372036854775807 Integer, occupying 8 bytes of storage space. Often used to store data that requires a larger integer range, such as order numbers, product quantities, etc.

Sample code:

CREATE TABLE orders (

order_number BIGINT,
quantity BIGINT

);

2. Floating point data type

1. FLOAT: Single-precision floating point number, occupying 4 bytes of storage space. Suitable for storing numbers with decimal parts, but data with low precision.

Sample code:

CREATE TABLE products (

id INT,
price FLOAT

);

2. DOUBLE: double precision floating point number, occupying 8 Bytes of storage space. Suitable for storing floating point numbers that require higher precision.

Sample code:

CREATE TABLE products (

id INT,
price DOUBLE

);

3. String data type

1. CHAR: Fixed-length string that can store up to 255 characters. Suitable for storing fixed-length data, such as gender, date, etc.

Sample code:

CREATE TABLE users (

id INT,
gender CHAR(1)

);

2. VARCHAR: variable length string, up to Can store 65535 characters. Suitable for storing data with variable length, such as user names, product names, etc.

Sample code:

CREATE TABLE users (

id INT,
username VARCHAR(20)

);

4. Date and time data types

1. DATE: Stores the date in the format YYYY-MM-DD. Suitable for storing data of year, month and day.

Sample code:

CREATE TABLE users (

id INT,
birthday DATE

);

2. DATETIME: stores date and time in YYYY format -MM-DD HH:MM:SS. Suitable for storing data that needs to contain time information, such as order time, log recording time, etc.

Sample code:

CREATE TABLE orders (

id INT,
order_time DATETIME

);

The above introduces the commonly used data types and application scenarios of MySQL. And provides some specific code examples. In actual development, choosing the appropriate storage method according to different data types can improve database performance and data accuracy. I hope this article can be helpful to readers when using MySQL for database design and development.

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