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What is the difference between related SQLite data-types like INT, INTEGER, SMALLINT and TINYINT?
... has no data types, there are storage classes in a manifest typing system, and yeah, it's confusing if you're used to traditional RDBMSes. Everything, internally, is stored as text. Data types are coerced/converted into various storage locations based on affinities (ala data types assigned to column...
Better way of getting time in milliseconds in javascript?
...sking this because I am trying to make a simple game engine in JavaScript, and when calculating the "delta frame time", I have to create a new Date object every frame. While I am not too worried about the performance implications of this, I am having some problems with the reliability of the exact t...
How to create a temporary directory?
I use to create a tempfile , delete it and recreate it as a directory:
4 Answers
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How do I return rows with a specific value first?
...turn the rows of the table where a column contains a specific value first, and then return the rest of the rows alphabetized.
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CSS3 background image transition
...ound-image 0.2s ease-in-out;
This is supported natively by Chrome, Opera and Safari. Firefox hasn't implemented it yet (bugzil.la). Not sure about IE.
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What is the difference between NULL, '\0' and 0?
...e appear to be differences between various values of zero -- NULL , NUL and 0 .
11 Answers
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在 App Inventor 2 中使用图像 · App Inventor 2 中文网
...ke:
Failed to allocate a 25165836 byte allocation with 3395432 free bytes and 3MB until OOM
What’s happening here is that the app is is running out of memory (OOM). In the case of the message above, the phone is trying to allocate 25 megabytes (25165836 bytes) but there are only 3 megabytes (33...
How to reset a single table in rails?
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In case anyone tried this and got an error, I did ActiveRecord::Base.connection.execute("DELETE from 'yourtablename'") and it worked because it would give me an error that said sqlite_sequence where name = 'yourtablename' is not a valid table name or ...
How do I seed a random class to avoid getting duplicate random values [duplicate]
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You should not create a new Random instance in a loop. Try something like:
var rnd = new Random();
for(int i = 0; i < 100; ++i)
Console.WriteLine(rnd.Next(1, 100));
The sequence of random numbers generated by a single Random instance is suppose...
Remove duplicated rows
...the fourth column no longer 'distinguishes' them,
# so they're duplicates and thrown out.
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