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MySQL load NULL values from CSV data
...can see empty strings '' when they download a csv (using IFNULL(Col,'') in SELECT INTO OUTFILE query) for excel but then uploads accept them as null vs having to deal with \N in the csv. Thanks!
– chrisan
Sep 29 '13 at 15:47
...
MySQL COUNT DISTINCT
...
Select
Count(Distinct user_id) As countUsers
, Count(site_id) As countVisits
, site_id As site
From cp_visits
Where ts >= DATE_SUB(NOW(), INTERVAL 1 DAY)
Group By site_id
...
Clear MySQL query cache without restarting server
...not clear it for me. Also, MySQL server restart does not help. An explicit SELECT SQL_NO_CACHE does the trick, but not RESET QUERY CACHE. sync && echo 3 | sudo tee /proc/sys/vm/drop_caches from the other answer didn't help, too.
– Jānis Elmeris
Aug 24 ...
What does mysql error 1025 (HY000): Error on rename of './foo' (errorno: 150) mean?
... have to find the name used to index it. To find that, issue the following select:
SHOW CREATE TABLE region;
This should show you the name of the index, something like this:
CONSTRAINT region_ibfk_1 FOREIGN
KEY (country_id) REFERENCES
country (id) ON DELETE NO
ACTION ON UPDATE NO ACT...
今年全球重大数据泄露事件盘点 - 资讯 - 清泛网 - 专注C/C++及内核技术
...泄露”时代。
1、“火车票达人”高危漏洞泄露300万用户密码
今年1月，据360补天漏洞响应平台显示，手机抢票App“火车票达人”存在高危漏洞，包括数百万机票、火车票订单用户的身份证号、用户名、明文密码、详细票务信息...
LINUX 磁盘掉电修复故障一列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...盘柜突然掉电， LINUX启动报磁盘错误在光标处输入系统的密码进入SHELL输入fsck -y dev sda3修复完成reboot 系统虚拟机环境，挂磁盘柜。磁盘柜突然掉电， LINUX启动报磁盘错误
在光标处输入系统的密码
进入SHELL
输入
fsck -y /...
web安全测试之基本观察学习笔记——使用WebScarab观察实时的POST数据 - 更...
...获登录CSDN论坛，从捕获的数据可以看到提交的用户名、密码均明文显示，同时还可以看到登录用户的隐藏信息（包括用户IDuserid、登录用户名username、登录密码password、注册邮箱email、上次登录时间lastlogintime、登录次数logintimes、...
Using MySQL with Entity Framework [closed]
...link - users can now click right through rather than have to copy/paste or select/goto
– kͩeͣmͮpͥ ͩ
Apr 18 '11 at 13:58
7
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MySQL, update multiple tables with one query
...'blah';
To see what this is going to update, you can convert this into a select statement, e.g.:
SELECT t2.t1_id, t2.t3_id, t1.a, t2.b, t2.c AS t2_c, t3.c AS t3_c
FROM t1
INNER JOIN t2 ON t2.t1_id = t1.id
INNER JOIN t3 ON t2.t3_id = t3.id
WHERE t1.a = 'blah';
An example using the same tables as...
Explicit vs implicit SQL joins
...e joined and how they are joined. Try compare larger SQL queries where you selecting from 8 different tables and you have lots of filtering in the where. By using join syntax you separate out the parts where the tables are joined, to the part where you are filtering the rows.
...