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A migration to add unique constraint to a combination of columns
...constraint will automatically create a unique btree index on the column or group of columns used in the constraint. A uniqueness constraint on only some rows can be enforced by creating a partial index. So IMHO there's no need to drop to raw SQL when the outcome will be basically the same as using ...
what is the difference between OLE DB and ODBC data sources?
...or databases and presents data in collections of records, each of which is grouped into a collection of fields. Each field has its own data type suitable to the type of data it contains.
Each database vendor (Microsoft, Oracle, Postgres, …) supplies an ODBC driver for their database.
There are a...
Java GUI frameworks. What to choose? Swing, SWT, AWT, SwingX, JGoodies, JavaFX, Apache Pivot? [close
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Tried Pivot demo "Kitchen sink", after opening some groups it keeps eating whole CPU. If it's because of Pivot design, then I definitely don't want it in my projects.
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Jun 20 '13 at 21:11
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linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...var/spool/squid 4096 16 256
cache_effective_user squid
cache_effective_group squid
dns_nameservers 61.144.56.101
cache_access_log /var/log/squid/access.log
cache_log /var/log/squid/cache.log
cache_store_log /var/log/squid/store.log
visible_hostname 192.168.16.1
cache_mgr lindenstar@1...
Different floating point result with optimization enabled - compiler bug?
..., .5 and std::numeric_limits<double>::epsilon() should be near 1, so grouping that addition means that std::numeric_limits<double>::epsilon() will be about the right size for what we're doing. If anything, std::numeric_limits<double>::epsilon() will be too large (when the sum of a...
What's the best way of structuring data on firebase?
...ts of members all in the same place, if you want to be able to iterate the groups later).
The primary difference between Firebase's real-time data and a SQL environment is querying data. There's no simple way to say "SELECT USERS WHERE X = Y", because of the real-time nature of the data (it's const...
Parse usable Street Address, City, State, Zip from a string [closed]
...le solution, you probably want to talk to a address correction vendor like Group1 or Trillium.
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Difference between Lookup() and Dictionary(Of list())
...e equivalent in efficiency - the lookup may well use a Dictionary<TKey, GroupingImplementation<TValue>> behind the scenes, for example. Choose between them based on your requirements. Personally I find that the lookup is usually a better fit than a Dictionary<TKey, List<TValue>&...
specify project file of a solution using msbuild
...tly without any additional work. You really should treat the sln file as a group of projects to make working in Visual Studio easier and not as a build input.
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How to write a Python module/package?
...gt; import hello
>>> hello.helloworld()
'hello'
>>>
To group many .py files put them in a folder. Any folder with an __init__.py is considered a module by python and you can call them a package
|-HelloModule
|_ __init__.py
|_ hellomodule.py
You can go about with the import...