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SQL - find records from one table which don't exist in another
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There's several different ways of doing this, with varying efficiency, depending on how good your query optimiser is, and the relative size of your two tables:
This is the shortest statement, and may be quickest if your phone book is very sh...
What does “./” (dot slash) refer to in terms of an HTML file path location?
...css/style.css ./ is the css folder.
This is important to remember because if you move CSS from /index.htm to /css/style.css the path will change.
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How to cherry-pick multiple commits
...mit A to commit B (where A is older than B), run:
git cherry-pick A^..B
If you want to ignore A itself, run:
git cherry-pick A..B
(Credit goes to damian, J. B. Rainsberger and sschaef in the comments)
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Add a prefix string to beginning of each line
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# If you want to edit the file in-place
sed -i -e 's/^/prefix/' file
# If you want to create a new file
sed -e 's/^/prefix/' file > file.new
If prefix contains /, you can use any other character not in prefix, or
escape t...
Link to the issue number on GitHub within a commit message
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If you want to link to a GitHub issue and close the issue, you can provide the following lines in your Git commit message:
Closes #1.
Closes GH-1.
Closes gh-1.
(Any of the three will work.) Note that this will link to the ...
ASP.NET custom error page - Server.GetLastError() is null
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If you store it in the application, what about all the other users of the system. Shouldn't it be in the session?
– BrianK
Aug 7 '09 at 1:40
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What should every developer know about databases? [closed]
Whether we like it or not, many if not most of us developers either regularly work with databases or may have to work with one someday. And considering the amount of misuse and abuse in the wild, and the volume of database-related questions that come up every day, it's fair to say that there are ce...
Why is $$ returning the same id as the parent process?
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Shouldn't the second bullet be kill -0 $! if we're talking about background processes? PID isn't set to anything by default.
– Isaac Freeman
Sep 12 '19 at 22:27
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jQuery - checkbox enable/disable
I have a bunch of checkboxes like this. If the "Check Me" checkbox is checked, all the other 3 checkboxes should be enabled, else they should be disabled. How can I do this using jQuery?
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Is there a performance difference between CTE , Sub-Query, Temporary Table or Table Variable?
In this excellent SO question , differences between CTE and sub-queries were discussed.
4 Answers
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