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convert_tz returns null
...L's dev site) the command was unable to convert between timezones such as
SELECT CONVERT_TZ('2004-01-01 12:00:00','UTC','MET') AS time
It turns out that on OS X there are two files that cause problems: /usr/share/zoneinfo/Factory and /usr/share/zoneinfo/+VERSION.
The fix... temporarily moving t...
How to filter SQL results in a has-many-through relation
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Results:
Total runtimes from EXPLAIN ANALYZE.
1) Martin 2: 44.594 ms
SELECT s.stud_id, s.name
FROM student s
JOIN student_club sc USING (stud_id)
WHERE sc.club_id IN (30, 50)
GROUP BY 1,2
HAVING COUNT(*) > 1;
2) Erwin 1: 33.217 ms
SELECT s.stud_id, s.name
FROM student s
JOIN ...
项目管理实践【三】每日构建【Daily Build Using CruiseControl.NET and MS...
...e Control Using VisualSVN Server and TortoiseSVN】中我们已经讲解了如何使用Torto 在上一篇项目管理实践教程二、源代码控制【Source Control Using VisualSVN Server and TortoiseSVN】中我们已经讲解了如何使用TortoiseSVN和VisualSVN Server来做简单的版本...
SQL how to make null values come last when sorting ascending
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select MyDate
from MyTable
order by case when MyDate is null then 1 else 0 end, MyDate
share
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improve this answer
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How to see log files in MySQL?
...print the value of error log, run this command in the terminal:
mysql -e "SELECT @@GLOBAL.log_error"
To read content of the error log file in real time, run:
sudo tail -f $(mysql -Nse "SELECT @@GLOBAL.log_error")
Note: Hit Control-C when finish
When general log is enabled, try:
sudo tail -f ...
VSS使用指南 - 开源 & Github - 清泛网 - 专注IT技能提升
...域的密码不同，系统将提示用户输入VSS的登录密码。关于如何修改VSS用户密码，详见“3.2.14修改用户密码”。
3.2 VSS浏览器
当你一打开VSS，如果你设定了密码的话，它会提示你输入密码。如果你没有设定密码，你可以直接看到...
How to create a database from shell command?
... I get this error ERROR 1046 (3D000) at line 27: No database selected when I run echo "create database databasename" | mysql -u -u username -p command
– keerthi
Mar 15 '13 at 5:16
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How to delete from select in MySQL?
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SELECT (sub)queries return result sets. So you need to use IN, not = in your WHERE clause.
Additionally, as shown in this answer you cannot modify the same table from a subquery within the same query. However, you can either...
Office在线预览及PDF在线预览的实现方式大集合 - 更多技术 - 清泛网 - 专注...
...其它程序，比如SQLServer，在Office365服务器上每次重启IIS会重置，也就是说你不能有任何其它网站。其主要是用来与SharePoint搭配使用。
参考链接：
http://technet.microsoft.com/zh-cn/library/jj219456(v=office.15).aspx
六、第三方成熟的服...
Can I concatenate multiple MySQL rows into one field?
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You can use GROUP_CONCAT:
SELECT person_id, GROUP_CONCAT(hobbies SEPARATOR ', ')
FROM peoples_hobbies
GROUP BY person_id;
As Ludwig stated in his comment, you can add the DISTINCT operator to avoid duplicates:
SELECT person_id, GROUP_CONCAT(DISTINCT ...