获取MySQL表的平均行长
为了获得MySQL中表的平均行长，可以使用INFORMATION_SCHEMA.TABLES。让我们首先创建一个表。以下是查询-
mysql> create table Client_information -> ( -> Id int, -> Name varchar(10) -> );
以下是使用insert命令在表中插入一些记录的查询-
mysql> insert into Client_information values(1,'Larry'); mysql> insert into Client_information values(2,'Mike'); mysql> insert into Client_information values(3,'Sam');
以下是使用select语句显示表中所有记录的查询-
mysql> select *from Client_information;
这将产生以下输出-
+------+-------+ | Id | Name | +------+-------+ | 1 | Larry | | 2 | Mike | | 3 | Sam | +------+-------+ 3 rows in set (0.00 sec)
以下是获取平均行长的查询-
mysql> select *from information_schema.tables where table_name='Client_information';
以下是显示“AVG_ROW_LENGTH”中的平均行长度的输出-
+---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+ | TABLE_CATALOG | TABLE_SCHEMA | TABLE_NAME | TABLE_TYPE | ENGINE |VERSION | ROW_FORMAT | TABLE_ROWS | AVG_ROW_LENGTH | DATA_LENGTH |MAX_DATA_LENGTH | INDEX_LENGTH | DATA_FREE | AUTO_INCREMENT | CREATE_TIME | UPDATE_TIME | CHECK_TIME | TABLE_COLLATION | CHECKSUM | CREATE_OPTIONS | TABLE_COMMENT | +---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+ | def | sample | client_information | BASE TABLE | InnoDB | 10 | Dynamic | 4 | 4096 | 16384 | 0 | 0 | 0 | NULL | 2019-03-11 20:02:40 | NULL | NULL | utf8_general_ci | NULL | | | | def | test | client_information | BASE TABLE | InnoDB | 10 | Dynamic | 3 | 5461 | 16384 | 0 | 0 | 0 | NULL | 2019-04-03 02:28:31 | 2019-04-03 02:29:00 | NULL | utf8mb4_0900_ai_ci | NULL | | | +---------------+--------------+--------------------+------------+--------+---------+------------+------------+----------------+-------------+-----------------+--------------+-----------+---------------+---------------------+---------------------+------------+--------------------+----------+----------------+---------------+ 2 rows in set (0.13 sec)