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Is there a MySQL option/feature to track history of changes to records?
...business requirement is "I want to audit the changes to the data - who did what and when?", you can usually use audit tables (as per the trigger example Keethanjan posted). I'm not a huge fan of triggers, but it has the great benefit of being relatively painless to implement - your existing code doe...
Java HashMap performance optimization / alternative
...ame key as an existing entry, that this overwrites the first entry. That's what I meant when I talked about looking for duplicates in the last paragraph: Whenever a key hashes to the same slot, HashMap must check if it's a duplicate of an existing key, or if they are just in the same slot by coincid...
Modifying a subset of rows in a pandas dataframe
...mes , how to subset df just by index ? df.loc[df[0]==0] doesn’t work ... What’s the alternative ? Thank You
– amipro
Apr 10 '19 at 9:13
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What Process is using all of my disk IO
If I use "top" I can see what CPU is busy and what process is using all of my CPU.
7 Answers
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What is the fastest substring search algorithm?
... Wow thanks. I'm reading the paper. If it turns out to be better than what I have, I'll definitely accept your answer.
– R.. GitHub STOP HELPING ICE
Aug 13 '13 at 16:09
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ADB not recognising Nexus 4 under Windows 7
...esn't have an extras\google directory, just an extras\android. Do you know what I'm doing wrong?
– Tim Bellis
Jan 28 '13 at 22:02
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Is Ruby pass by reference or by value?
...itional terminology, Ruby is strictly pass-by-value. But that's not really what you're asking here.
Ruby doesn't have any concept of a pure, non-reference value, so you certainly can't pass one to a method. Variables are always references to objects. In order to get an object that won't change out ...
How to have Android Service communicate with Activity
... intent from your service when you want to send out your status updates or what have you.
Make sure you wouldn't be unhappy if some other app listened for your Intent (could anyone do anything malicious?), but beyond that, you should be alright.
Code sample was requested:
In my service, I have th...
What's the difference between comma separated joins and join on syntax in MySQL? [duplicate]
...der as the number of tables increases.
The JOIN syntax makes it explicit what criteria affects which tables (giving a condition). Also, the second way is the older standard.
Although, to the database, they end up being the same
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When and why I should use session_regenerate_id()?
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What is session_regenerate_id()?
As the function name says, it is a function that will replace the current session ID with a new one, and keep the current session information.
What does it do?
It mainly helps prevent session ...