在 MySQL 中使用 INT(1) 与 TINYINT(1) 有区别吗？-猿码集

1. Introduction

MySQL is a popular open-source relational database management system that is widely used across various industries. When creating tables in MySQL, one of the common decisions that developers need to make is choosing the appropriate data type for each column. In this article, we will discuss the difference between INT(1) and TINYINT(1) data types in MySQL.

2. What is INT(1)?

INT(1) is a data type in MySQL that is used to store whole numbers. The (1) in INT(1) specifies the display width of the numbers in the column. This means that if the value stored in the INT(1) column is less than 10, it will be displayed with a leading zero. For example, if the value stored is 9, it will be displayed as 09.

2.1 Example of INT(1)

Here is an example of creating a table with INT(1) data type:


CREATE TABLE test (
  id INT(1) NOT NULL,
  name VARCHAR(50) NOT NULL
);

In the above example, the "id" column is declared as INT(1) data type. This column can store integers with a maximum value of 127. If a value greater than 127 is stored, it will be truncated to fit into the column.

3. What is TINYINT(1)?

TINYINT(1) is also a data type in MySQL that is used to store whole numbers. However, TINYINT(1) has a range of -128 to 127, which means it can store smaller values than the INT(1) data type. The (1) in TINYINT(1) specifies the display width of the numbers in the column, similar to INT(1).

3.1 Example of TINYINT(1)

Here is an example of creating a table with TINYINT(1) data type:


CREATE TABLE test (
  id TINYINT(1) NOT NULL,
  name VARCHAR(50) NOT NULL
);

In the above example, the "id" column is declared as TINYINT(1) data type. This column can store integers with a maximum value of 127 and a minimum value of -128. If a value outside of this range is stored, it will be truncated to fit into the column.

4. Difference between INT(1) and TINYINT(1)

Both INT(1) and TINYINT(1) data types have a display width of 1, which means they will be displayed as 1 digit numbers. However, there are a few differences between the two data types:

4.1 Range

TINYINT(1) has a smaller range than INT(1). TINYINT(1) can store values from -128 to 127, whereas INT(1) can store values from -2147483648 to 2147483647. Therefore, if you need to store larger values, INT(1) is the appropriate data type.

4.2 Storage Size

Both INT(1) and TINYINT(1) take up 1 byte of storage per row. However, if you have a large table with millions of rows, the storage space difference between the two data types can be significant.

4.3 Performance

Performance wise, there is not much difference between INT(1) and TINYINT(1). However, if you have a large table with millions of rows, TINYINT(1) can be slightly faster to execute queries on due to its smaller storage size.

4.4 Use Case

The choice between INT(1) and TINYINT(1) ultimately depends on your use case. If you need to store small integers and want to save on storage space, TINYINT(1) is the appropriate data type. If you need to store larger integers and do not mind using up a bit more storage space, INT(1) is the appropriate data type.

5. Conclusion

In conclusion, INT(1) and TINYINT(1) are both data types in MySQL that are used to store whole numbers. INT(1) has a larger range and takes up slightly more storage space than TINYINT(1), but both have similar performance. The choice between the two data types ultimately depends on your use case and the values that you need to store.

在 MySQL 中使用 INT(1) 与 TINYINT(1) 有区别吗？