Mysql中怎么查询数据字典

Mysql中怎么查询数据字典，相信很多没有经验的人对此束手无策，为此本文总结了问题出现的原因和解决方法，通过这篇文章希望你能解决这个问题。

SELECT        a.TABLE_NAME as tableName,b.TABLE_COMMENT as tableComment,        a.COLUMN_NAME as columnName,        a.COLUMN_COMMENT as columnComment,        a.COLUMN_TYPE as columnType,        null as length,        null as scale,        a.IS_NULLABLE as isNullable        from information_schema.COLUMNS a        LEFT JOIN information_schema.TABLES b ON a.TABLE_NAME=b.TABLE_NAME        where a.TABLE_SCHEMA='hbsm' and a.TABLE_NAME in('t_sm_saleapply_benef_status')order by a.TABLE_NAME

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