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Are unused CSS images downloaded?
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Safari: Doesn't
IE8: Doesn't
IE7: Doesn't
IE6: Unknown (Can someone test and comment?)
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Select rows which are not present in other table
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There are basically 4 techniques for this task, all of them standard SQL.
NOT EXISTS
Often fastest in Postgres.
SELECT ip
FROM login_log l
WHERE NOT EXISTS (
SELECT -- SELECT list mostly irrelevant; can just be empty in Postgres
FROM ip_location
WHERE ip = l.ip
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How can a LEFT OUTER JOIN return more records than exist in the left table?
...ave a very basic LEFT OUTER JOIN to return all results from the left table and some additional information from a much bigger table. The left table contains 4935 records yet when I LEFT OUTER JOIN it to an additional table the record count is significantly larger.
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How to declare std::unique_ptr and what is the use of it?
I try to understand how std::unique_ptr works and for that I found this document. The author starts from the following example:
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How to get IntPtr from byte[] in C#
... a byte[] to a method takes a IntPtr Parameter in C#, is that possible and how?
8 Answers
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SQL Server equivalent to MySQL enum data type?
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Why not use a table that defines valid values, and then use a foreign key constraint instead?
– Elaskanator
Dec 5 '18 at 17:04
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Why is sed not recognizing \t as a tab?
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Not all versions of sed understand \t. Just insert a literal tab instead (press Ctrl-V then Tab).
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How to execute more than one maven command in bat file?
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call mvn package
Note that you don't need semicolons in batch files. And the reason why you need to use call is that mvn itself is a batch file and batch files need to call each other with call, otherwise control does not return to the caller.
If you want subsequent commands to echo to the co...
Given an emacs command name, how would you find key-bindings ? (and vice versa)
If I know an emacs command name, says, "goto-line"; what if I want to query whether if there are any key-sequences bound to this command ?
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Stop Visual Studio from launching a new browser window when starting debug?
..... from the main menu or right click your project in the Solution Explorer and choose Properties), then navigate to the Web tab and under Start Action choose Don't open a page. Wait for a request from an external application.
You will still be able to use any browser (or Fiddler, whatever) to acces...