从包含域名记录和搜索量的 MySQL 表中找出热门域名
mysqlmysqli database更新于 2024/1/30 8:31:00
为此，您可以将 GROUP BY 与 ORDER BY 子句一起使用。我们首先创建一个表。 &mins;
mysql> create table DemoTable -> ( -> URL varchar(40), -> DomainName varchar(20), -> SearchTimes int -> ); Query OK, 0 rows affected (0.62 sec)
使用 insert 命令在表中插入一些记录 −
mysql> insert into DemoTable values('www.gmail.com','gmail.com',4);
Query OK, 1 row affected (0.26 sec)
mysql> insert into DemoTable values('www.google.com','google.com',3);
Query OK, 1 row affected (0.25 sec)
mysql> insert into DemoTable values('www.gmail.com','gmail.com',9);
Query OK, 1 row affected (0.15 sec)
mysql> insert into DemoTable values('www.facebook.com','facebook.com',8);
Query OK, 1 row affected (0.13 sec)
mysql> insert into DemoTable values('www.facebook.com','facebook.com',2);
Query OK, 1 row affected (0.16 sec)
使用 select 语句显示表中的所有记录 −
mysql> select *from DemoTable;
这将产生以下输出 −
+------------------+--------------+-------------+ | URL | DomainName | SearchTimes | +------------------+--------------+-------------+ | www.gmail.com | gmail.com | 4 | | www.google.com | google.com | 3 | | www.gmail.com | gmail.com | 9 | | www.facebook.com | facebook.com | 8 | | www.facebook.com | facebook.com | 2 | +------------------+--------------+-------------+ 5 rows in set (0.00 sec)
以下查询通过仅显示搜索量最高的域来查找热门域。计算每个域的搜索时间，并显示搜索量最高的域 −
mysql> select DomainName,sum(SearchTimes) as TotalSearch from DemoTable -> group by DomainName -> order by TotalSearch desc;
这将产生以下输出 −
+--------------+-------------+ | DomainName | TotalSearch | +--------------+-------------+ | gmail.com | 13 | | facebook.com | 10 | | google.com | 3 | +--------------+-------------+ 3 rows in set (0.00 sec)
