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Add unique constraint to combination of two columns
...ng an exception (exceptions are expensive).
http://www.sqlperformance.com/2012/08/t-sql-queries/error-handling
http://www.mssqltips.com/sqlservertip/2632/checking-for-potential-constraint-violations-before-entering-sql-server-try-and-catch-logic/
If you want to prevent exceptions from bubbling up...
Can a Windows batch file determine its own file name?
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On Win2012, %cd% will return the Current Directory of the process that called the batch file. So, if you are at a prompt in D:\dir1 and enter Y:\foo\bar.bat, if bar.bat has @echo %cd% then it will output D:\dir1.
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Backbone.View “el” confusion
...difficult to reuse it. see "Decouple view from DOM..." coenraets.org/blog/2012/01/…
– Scott Coates
May 4 '12 at 16:02
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Do DOM tree elements with ids become global variables?
...ed I talk about this in more detail on my blog - https://www.tjvantoll.com/2012/07/19/dom-element-references-as-global-variables/.
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Building and running app via Gradle and Android Studio is slower than via Eclipse
... I have a pretty big project and it takes 2 - 3 minutes on MacBook Pro 2012 Core i7, 8 GB RAM. Is it ok?
– Sermilion
Jun 28 '17 at 14:53
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Best way to center a on a page vertically and horizontally? [duplicate]
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All browsers from 2012–2013 upwards support flex boxes. From today’s standpoint it should be safe enough to use it for new applications under most circumstances. The only situation I can think of where the older model should be preferred a...
Simple way to transpose columns and rows in SQL?
... entirely in both the UNPIVOT and the (re)PIVOT operations.
MS SQL Server 2012 Schema Setup:
create table tbl (
color varchar(10), Paul int, John int, Tim int, Eric int);
insert tbl select
'Red' ,1 ,5 ,1 ,3 union all select
'Green' ,8 ,4 ,3 ,5 union all select
'Blue' ,2 ,2 ,9 ,1;
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Cleanest and most Pythonic way to get tomorrow's date?
...m UT1 (Earth rotation). There are 25 leap seconds accumulated from 1972 to 2012. Earthquakes are too weak to cause it (a single earthquake may introduce microsecond changes -- thousand times less than a typical millisecond difference in the duration of the day from 86400 SI seconds).
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What are the rules for the “…” token in the context of variadic templates?
...alk "Variadic Templates are Funadic" by Andrei Alexandrescu at GoingNative 2012. I can recommend it for a good introduction on variadic templates.
There are two things one can do with a variadic pack. It's possible to apply sizeof...(vs) to get the number of elements and expand it.
Expansion rul...
MQTT物联网协议完全实践指南 · App Inventor 2 中文网
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