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Add unique constraint to combination of two columns
... CONSTRAINT uq_yourtablename UNIQUE(column1, column2);
or
CREATE UNIQUE INDEX uq_yourtablename
ON dbo.yourtablename(column1, column2);
Of course, it can often be better to check for this violation first, before just letting SQL Server try to insert the row and returning an exception (exceptio...
Single huge .css file vs. multiple smaller specific .css files? [closed]
... to deliver a single, minimised CSS file for the site (which will be far smaller and faster than a normal single CSS source file), while maintaining the nicest development environment, with everything neatly split into components.
Sass and LESS have the added advantage of variables, nesting and oth...
How to remove the left part of a string?
...
I prefer pop to indexing [-1]:
value = line.split("Path=", 1).pop()
to
value = line.split("Path=", 1)[1]
param, value = line.split("Path=", 1)
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Regular expression for a hexadecimal number?
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If you're using Perl or PHP, you can replace
[0-9a-fA-F]
with:
[[:xdigit:]]
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How can I force clients to refresh JavaScript files?
...sion of the file and they do not see the update. Obviously, on a support call, we can simply inform them to do a ctrl F5 refresh to ensure that they get the up-to-date files from the server, but it would be preferable to handle this before that time.
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What is the difference between Scope_Identity(), Identity(), @@Identity, and Ident_Current()?
...know Scope_Identity() , Identity() , @@Identity , and Ident_Current() all get the value of the identity column, but I would love to know the difference.
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How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
...:
http://www.oracle.com/technetwork/developer-tools/datamodeler/overview/index.html
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What is the most effective way to get the index of an iterator of an std::vector?
I'm iterating over a vector and need the index the iterator is currently pointing at. AFAIK this can be done in two ways:
9...
Get last element of Stream/List in a one-liner
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If list is empty, this code will throw ArrayIndexOutOfBoundsException.
– Dragon
Jan 17 '18 at 14:14
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Ignore mouse interaction on overlay image
... of you menu bar link -->
<img id="imgOverlay" src="w3.png" style="z-index:4;position:absolute;top:0px;left:0px;width:100px;height:40px;" \>
<!-- Your link here -->
<a href="javascript:alert('Hello!')" >
<div id="mylinkAction" style="z-index:5;position:absolute;top:0px;left:0...