本文介绍了一种使用 SQL 语句来查询指定数据库中特定表的所有字段名称、数据类型、是否允许为空、主键信息及字段说明的方法。通过该 SQL 脚本可以快速了解表结构，适用于数据库开发和维护。
USE information_schema;
SELECT
C.COLUMN_NAME AS '字段名',
C.COLUMN_TYPE AS '数据类型',
C.IS_NULLABLE AS '允许为空',
C.EXTRA AS 'PK',
C.COLUMN_COMMENT AS '字段说明'
FROM
COLUMNS C
INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA
AND C.TABLE_NAME = T.TABLE_NAME
WHERE
T.TABLE_SCHEMA = 'lezhu_test' and T.TABLE_NAME='tp_version'
SELECT
C.COLUMN_NAME AS '字段名',
C.COLUMN_TYPE AS '数据类型',
C.IS_NULLABLE AS '允许为空',
C.EXTRA AS 'PK',
C.COLUMN_COMMENT AS '字段说明'
FROM
COLUMNS C
INNER JOIN TABLES T ON C.TABLE_SCHEMA = T.TABLE_SCHEMA
AND C.TABLE_NAME = T.TABLE_NAME
WHERE
T.TABLE_SCHEMA = 'lezhu_test' and T.TABLE_NAME='tp_version'
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