function record(){ $table = new table; $clogin = new login; $date = date("F j, Y, g:i a"); $ip = $_SERVER['REMOTE_ADDR']; $uri = $_SERVER['REQUEST_URI']; mysql_query("insert into log (player, date, ip, on) values ('$clogin->username', '$date', '$ip', '$uri...
mysql> INSERT INTO my_table (phone) VALUES (NULL); mysql> INSERT INTO my_table (phone) VALUES (""); Both statements insert a value into thephonecolumn, but the first inserts aNULLvalue and the second inserts an empty string. The meaning of the first can be regarded as “phone number...
the MySQL optimizer considers many techniques to efficiently perform the lookups involved in an SQL query. A query on a huge【hjuːdʒ巨大的;非常成功的;极多的;走红的;程度高的;】 table can be performed without reading all the rows; a join involving several tables can be ...
СозданиеподключаемогомодуляИИдлясоединителя (предварительнаяверсия) Сертификациясоединителя Вопросыиответыопользовательскихсоединител...
pt-query-digest 属于 Percona Toolkit 工具集中最常用的一种,号称 MySQL DBA 必备工具之一,其能够分析MySQL数据库的 slow log 、 general log 、 binary log 文件,同时也可以使用 show processlist 或从tcpdump 抓取的 MySQL 协议数据来进行分析。 安装Percona Toolkit ...
MySQL Database 2 18724 limit query results to no duplicates on 1 field by: Dom | last post by: I need to run a query based on a query in Access. The second query has a number of conditions which all work well, but there is one more contition I need to set to make it ru...
A query works the same way – it adds meaning to the code, allowing the system to understand and execute actions accordingly. Be it SQL or any other query language, both the user and the database can exchange information as long as they use the same language. ...
mysql查询错误:topicid选择,从vcgroupfgroupid。vcg_topicipbtopicid=136871的限制1;sqlserver错误:“选择”命令,用户拒绝“verycd_ipb192.168.1.32''@''vcg_topic”表sql错误代码:日期:星期一302012f2012年7月上午8时48分26秒 翻译结果5复制译文编辑译文朗读译文返回顶部 ...
Meaning, 1 category moved from parent to another (I am updating this in my original post, this is not clear). –Alexander Commented Nov 29, 2010 at 22:22 is old_category the id from the first table? –johnny Commented Nov 29, 2010 at 22:31 Add a comment | 0 Join them?
How to optimize that one query to run faster ? I know I must have added too many individual indexes, should I group them in this case ? If so, how ? The table has40 million records, a bit hard/slow to experiment with different index settings without knowing what I am doing. ...