Is there a difference between using INT(1) and TINYINT(1) in MySQL?-Mysql Tutorial-php.cn

在 MySQL 中使用 INT(1) 与 TINYINT(1) 有区别吗？

The number 1 used in brackets is for width display only. INT(1) and TINYINT(1) do not affect storage.

TINYINT occupies 1 byte, which means its range is -128 to 127, while int occupies 4 bytes; its range is -2147483648 to 2147483647

To understand the width Show, let's create a table -

mysql> create table intAndTinyint −> ( −> FirstNumber int(1) zerofill, −> SecondNumber tinyint(1) zerofill −> ); Query OK, 0 rows affected (0.52 sec)

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Now you can insert records in the table. The query is as follows -

mysql> insert into intAndTinyint values(1,1); Query OK, 1 row affected (0.32 sec) mysql> insert into intAndTinyint values(12,12); Query OK, 1 row affected (0.26 sec) mysql> insert into intAndTinyint values(123,123); Query OK, 1 row affected (0.14 sec)

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Use the select statement to display all records in the table. The query is as follows -

mysql> select *from intAndTinyint;

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The following is the output -

+-------------+--------------+ | FirstNumber | SecondNumber | +-------------+--------------+ | 1 | 1 | | 12 | 12 | | 123 | 123 | +-------------+--------------+ 3 rows in set (0.00 sec)

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You will understand this when the number 1 of the bracket increases to greater than 1 by padding with zeros. Let's look at an example just for INT to understand the concept of width zero padding.

Create a table. Following is the query to create the table -

mysql> create table intVsIntAnyThingDemo −> ( −> Number1 int(11) unsigned zerofill, −> Number int(13) unsigned zerofill −> ); Query OK, 0 rows affected (1.17 sec)

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Now you can insert records in the table with the help of insert command. Here, we set different widths for INT. The query is as follows -

mysql> insert into intVsIntAnyThingDemo values(12345,6789); Query OK, 1 row affected (0.44 sec) mysql> insert into intVsIntAnyThingDemo values(3,2); Query OK, 1 row affected (0.20 sec) mysql> insert into intVsIntAnyThingDemo values(12,89); Query OK, 1 row affected (0.15 sec) mysql> insert into intVsIntAnyThingDemo values(123,6789); Query OK, 1 row affected (0.17 sec) mysql> insert into intVsIntAnyThingDemo values(1234,6789); Query OK, 1 row affected (0.14 sec)

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Display all records with the help of select statement. The query is as follows -

mysql> select *from intVsIntAnyThingDemo;

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The following is the output showing different widths and zero padding

+-------------+---------------+ | Number1 | Number | +-------------+---------------+ | 00000012345 | 0000000006789 | | 00000000003 | 0000000000002 | | 00000000012 | 0000000000089 | | 00000000123 | 0000000006789 | | 00000001234 | 0000000006789 | +-------------+---------------+ 5 rows in set (0.00 sec)

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