大约有 40,000 项符合查询结果（耗时：0.0356秒） [XML]
SQL Server SELECT INTO @variable?
...not all support TOP 1 as Adrian mentioned. SQL Server / MS Access use TOP, MySQL uses LIMIT, and Oracle uses ROWNUM. See w3schools.com/sql/sql_top.asp for more information.
– Tyler
Jul 7 '17 at 12:08
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How to overcome root domain CNAME restrictions?
... hosts provide a way to get CNAME-like functionality at the zone apex (the root domain level, for the naked domain name) using a custom record type. Such records include, for example:
ALIAS at DNSimple
ANAME at DNS Made Easy
ANAME at easyDNS
CNAME at CloudFlare
For each provider, the setup is si...
Cron and virtualenv
... SHELL environment variable to be /bin/bash:
SHELL=/bin/bash
*/10 * * * * root source /path/to/virtualenv/bin/activate && /path/to/build/manage.py some_command > /dev/null
It's tricky to spot why this fails as /var/log/syslog doesn't log the error details. Best to alias yourself to ro...
TokuMX vs. MongoDB 性能对比 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...占用也比MongoDB少10%左右）。这种思路不稀奇，5.x版本的MySQL，如果设定file_format为Barracuda，也可以直接对表做压缩，同时不影响外部操作；提高写入速度则值得一提，原来TokuMX的做法是使用 分形树索引（Fractal Tree Index） ，替代...
How can I create a self-signed cert for localhost?
...cking around, you can do: sudo security add-trusted-cert -p ssl -d -r trustRoot -k ~/Library/Keychains/login.keychain localhost.crt
– philfreo
Apr 8 '16 at 0:50
1
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How can I remove a pytz timezone from a datetime object?
...Datetime.replace(tzinfo=None)
Why would you do this? One example is that mysql does not support timezones with its DATETIME type. So using ORM's like sqlalchemy will simply remove the timezone when you give it a datetime.datetime object to insert into the database. The solution is to convert your ...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...rchar, it's free to use 1-3 bytes per character as needed. This is in the MySQL manual: dev.mysql.com/doc/refman/5.0/en/charset-unicode-utf8.html
– Gavin Towey
Mar 27 '14 at 2:14
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How to squash all git commits into one?
...s answer was given. No, there is a simpler and better way: git rebase -i --root. See: stackoverflow.com/a/9254257/109618
– David J.
Jul 12 '13 at 5:24
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Understanding recursion [closed]
...lly called "left" and "right"; again the children can be nodes, or null. A root is a node that is not the child of any other node.
Imagine that a node, in addition to its children, has a value, a number, and imagine that we wish to sum all the values in some tree.
To sum value in any one node, we ...
Naming cookies - best practices [closed]
... This is especially problematic if your cookies are scoped to your website root "/", and not to the folder where they are consumed.
So I say, two best practices:
make sure you limit scope of your cookies to the path where they are read and written, (third argument of setcookie() method does thi...