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MongoDB: How to query for records where field is null or not set?
I have an Email document which has a sent_at date field:
6 Answers
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Where does this come from: -*- coding: utf-8 -*-
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This way of specifying the encoding of a Python file comes from PEP 0263 - Defining Python Source Code Encodings.
It is also recognized by GNU Emacs (see Python Language Reference, 2.1.4 Encoding declarations), though I don't know if it was the first program to use that syntax.
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Create array of symbols
Is there a cleaner way to do something like this?
3 Answers
3
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Get TransactionScope to work with async / await
I'm trying to integrate async / await into our service bus.
I implemented a SingleThreadSynchronizationContext based on this example http://blogs.msdn.com/b/pfxteam/archive/2012/01/20/10259049.aspx .
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How does OpenID authentication work?
I am a little curious to know about how OpenID authentication works.
4 Answers
4
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How add “or” in switch statements?
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By stacking each switch case, you achieve the OR condition.
switch(myvar)
{
case 2:
case 5:
...
break;
case 7:
case 12:
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break;
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}
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How can I do SELECT UNIQUE with LINQ?
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The Distinct() is going to mess up the ordering, so you'll have to the sorting after that.
var uniqueColors =
(from dbo in database.MainTable
where dbo.Property == true
select dbo.Color.Name).Distinct...
What is a “Bitmap heap scan” in a query plan?
I want to know the principle of "Bitmap heap scan", I know this often happens
when I execute a query with OR in the condition.
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Why does [5,6,8,7][1,2] = 8 in JavaScript?
I can't wrap my mind around this quirk.
3 Answers
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SQL set values of one column equal to values of another column in the same table
I have a table with two DATETIME columns.
5 Answers
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