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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 Postgr...
How do I trim whitespace from a string?
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Just one space, or all consecutive spaces? If the second, then strings already have a .strip() method:
>>> ' Hello '.strip()
'Hello'
>>> ' Hello'.strip()
'Hello'
>>> 'Bob has a cat'.strip()
'Bob has a cat'
>>&...
How to remove line breaks from a file in Java?
How can I replace all line breaks from a string in Java in such a way that will work on Windows and Linux (ie no OS specific problems of carriage return/line feed/new line etc.)?
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How to get back to the latest commit after checking out a previous commit?
...o use git was not knowing what specific keywords (e.g. "master") I can actually substitute in for placeholder words like "branchname".
– AbePralle
Feb 2 '12 at 7:19
3
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How to select rows with no matching entry in another table?
... t2.ID IS NULL
The key points are:
LEFT JOIN is used; this will return ALL rows from Table1, regardless of whether or not there is a matching row in Table2.
The WHERE t2.ID IS NULL clause; this will restrict the results returned to only those rows where the ID returned from Table2 is null - in o...
How to uninstall npm modules in node js?
As commonly known, any npm module can be installed by running a simple command: npm install <module_name> .
21 Answe...
Is there a way to list pip dependencies/requirements?
Without going through with the installation, I want to quickly see all the packages that pip install would install.
7 Ans...
Why is Swift compile time so slow?
...Well, it turned out that Rob Napier was right. It was one single file (actually one method) that was causing the compiler to go berzek.
Now don't get me wrong. Swift does recompile all your files each time, but the great thing now, is that Apple added real-time compilation feedback over the files i...
How can one change the timestamp of an old commit in Git?
...c hash of the commit you're looking to fix.
This will invalidate that and all future hashes.
Example:
If you wanted to change the dates of commit 119f9ecf58069b265ab22f1f97d2b648faf932e0, you could do so with something like this:
git filter-branch --env-filter \
'if [ $GIT_COMMIT = 119f9ecf5...
System.Data.SQLite Close() not releasing database file
...em a while ago while writing a DB abstraction layer for C# and I never actually got around to finding out what the issue was. I just ended up throwing an exception when you attempted to delete a SQLite DB using my library.
Anyway, this afternoon I was looking through it all again and figured I woul...