Home Database Mysql Tutorial How to use sql statement to query the storage structure of mysql database

How to use sql statement to query the storage structure of mysql database

Apr 14, 2024 pm 07:45 PM
mysql sql statement

要查询 MySQL 数据库存储结构,可以使用以下 SQL 语句:SHOW CREATE TABLE table_name;该语句将返回表的列定义和表选项的信息,包括列的名称、数据类型、约束和表的一般属性,例如存储引擎和字符集。

How to use sql statement to query the storage structure of mysql database

如何使用 SQL 语句查询 MySQL 数据库存储结构

要查询 MySQL 数据库存储结构,可以使用以下 SQL 语句:

SHOW CREATE TABLE table_name;
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其中,table_name 是要查询存储结构的表的名称。

该语句将返回一个包含以下信息的字符串:

  • Table structure:表的列定义,包括列名、数据类型、是否允许空值以及其他约束。
  • Table options:有关表的一般属性的信息,例如存储引擎、字符集和排序规则。

详细说明:

  • 列定义:每个列的信息都以以下格式显示:
<code>column_name data_type [NOT NULL | NULL] [DEFAULT default_value] [constraints]</code>
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其中:

<code>* `column_name` 是列的名称。
* `data_type` 是列的数据类型(例如,`INT`、`VARCHAR`)。
* `NOT NULL` 或 `NULL` 表示该列是否允许空值。
* `DEFAULT default_value` 是列的默认值(如果指定)。
* `constraints` 是任何适用的列约束(例如,`PRIMARY KEY`、`UNIQUE`)。
</code>
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  • 表选项:表选项以以下格式显示:
<code>[TABLE option_name = option_value, ...]</code>
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其中:

<code>* `option_name` 是表选项的名称(例如,`ENGINE`、`CHARSET`)。
* `option_value` 是选项的值。
</code>
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示例:

查询名为 users 的表的存储结构:

SHOW CREATE TABLE users;
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该语句可能返回类似以下内容的字符串:

CREATE TABLE `users` (
  `id` INT NOT NULL AUTO_INCREMENT,
  `username` VARCHAR(64) NOT NULL UNIQUE,
  `password` VARCHAR(64) NOT NULL,
  `email` VARCHAR(128) NOT NULL,
  `created_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  `updated_at` TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8
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