SELECT
COLUMN_NAME 列名,
COLUMN_TYPE 数据类型,
CHARACTER_MAXIMUM_LENGTH 长度,
COLUMN_KEY 主键,
IS_NULLABLE 是否为空,
COLUMN_COMMENT 备注
FROM
INFORMATION_SCHEMA.COLUMNS
WHERE
table_schema = 'databasename'
AND
table_name = 'tablename'
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