mysql一些sql语句，查看表信息
查看表字段信息
SELECT column_name AS `列名`, data_type AS `数据类型`, character_maximum_length AS `字符长度`, numeric_precision AS `数字长度`, numeric_scale AS `小数位数`, is_nullable AS `是否允许非空`, CASE WHEN extra = 'auto_increment' THEN 1 ELSE 0 END AS `是否自增`, column_default AS `默认值`, column_comment AS `备注`FROM Information_schema.columnsWHERE table_Name='test';
2.显示数据库 表中数据项信息
SHOW TABLE STATUS FROM `database_name`;
3.显示表名
SHOW TABLES FROM `database_name`;