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查询MySQL中的平均行长？

2024-05-01 18:32:03 394

您可以使用INFORMATION_SCHEMA.TABLES和AVG_ROW_LENGTH在MySQL中查询平均行长-

SELECT AVG_ROW_LENGTH FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_NAME = ‘yourTableName’;

让我们首先创建一个表-

mysql> create table DemoTable
(
   StudentId int NOT NULL AUTO_INCREMENT PRIMARY KEY,
   StudentName varchar(100)
);

使用插入命令在表中插入记录-

mysql> insert into DemoTable(StudentName) values('John');
mysql> insert into DemoTable(StudentName) values('Larry');
mysql> insert into DemoTable(StudentName) values('Sam');
mysql> insert into DemoTable(StudentName) values('Mike');

使用选择命令显示表中的记录-

mysql> select *from DemoTable;

这将产生以下输出-

+-----------+-------------+
| StudentId | StudentName |
+-----------+-------------+
| 1         | John        |
| 2         | Larry       |
| 3         | Sam         |
| 4         | Mike        |
+-----------+-------------+
4 rows in set (0.00 sec)

在MySQL中查询平均行长-

mysql> SELECT AVG_ROW_LENGTH FROM information_schema.tables WHERE TABLE_NAME = 'DemoTable';

这将产生以下输出-

+----------------+
| AVG_ROW_LENGTH |
+----------------+
| 4096           |
+----------------+
1 row in set (0.11 sec)

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查询MySQL中的平均行长？

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