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In Jinja2, how do you test if a variable is undefined?
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edited Jul 29 '14 at 0:16
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C/C++ macro string concatenation
Is it possible to concatenate have STR3 == "s1"?
You can do this by passing args to another Macro function. But is there a direct way?
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Simplest code for array intersection in javascript
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How to randomly select rows in SQL?
... a table "customerNames" which has two columns "Id" and "Name" and approx. 1,000 results.
11 Answers
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Enable 'xp_cmdshell' SQL Server
... of the xp_cmdshell MSDN docs:
http://msdn.microsoft.com/en-us/library/ms190693.aspx:
-- To allow advanced options to be changed.
EXEC sp_configure 'show advanced options', 1
GO
-- To update the currently configured value for advanced options.
RECONFIGURE
GO
-- To enable the feature.
EXEC sp_conf...
How can I selectively escape percent (%) in Python strings?
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>>> test = "have it break."
>>> selectiveEscape = "Print percent %% in sentenc...
What is a lambda (function)?
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Lambda comes from the Lambda Calculus and refers to anonymous functions in programming.
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How to subtract 30 days from the current datetime in mysql?
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SELECT * FROM table
WHERE exec_datetime BETWEEN DATE_SUB(NOW(), INTERVAL 30 DAY) AND NOW();
h...
How do I base64 encode (decode) in C?
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Get battery level and state in Android
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