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Truncating all tables in a Postgres database
I regularly need to delete all the data from my PostgreSQL database before a rebuild. How would I do this directly in SQL?
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if A vs if A is not None:
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The statement
if A:
will call A.__nonzero__() (see Special method names documentation) and use the return value of that function. Here's the summary:
object.__nonzero__(self)
Called to implement truth value testing and the built-in operation ...
Converting string to title case
... @ruffin No. Substring with a single int parameter starts at the given index, and returns everything to the end of the string.
– krillgar
Dec 13 '19 at 17:19
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Algorithm to implement a word cloud like Wordle
... use last-hit caching, hierarchical bounding boxes, and a quadtree spatial index (all of which are things you can learn more about with some diligent googling).
Edit: As Reto Aebersold pointed out, there's now a book chapter, freely available, that covers this same territory: Beautiful Visualizatio...
android layout: This tag and its children can be replaced by one and a compound drawable
... using the TextView.getCompoundDrawables(), accessing the correct drawable index and finally calling getBounds().
– Avinash R
Jan 5 '14 at 20:22
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What is the difference between class and instance attributes?
...just look in each instance's __dict__ and the class's __dict__. It just usually doesn't matter very much whether immutable types are shared or not.
– abarnert
Oct 29 '14 at 22:58
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Setting href attribute at runtime
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agree '.prop' will get full path like: http : //www.../index.html while .attr will get only: 'index.html'
– DevWL
Aug 28 '15 at 0:41
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How can a LEFT OUTER JOIN return more records than exist in the left table?
I have a very basic LEFT OUTER JOIN to return all results from the left table and some additional information from a much bigger table. The left table contains 4935 records yet when I LEFT OUTER JOIN it to an additional table the record count is significantly larger.
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Multiple select statements in Single query
I am generating a report in php (mysql),
6 Answers
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What does extern inline do?
...e, static inline, and extern inline constructs; most pre-C99 compiler generally follow its lead.
GNU89:
inline: the function may be inlined (it's just a hint though). An out-of-line version is always emitted and externally visible. Hence you can only have such an inline defined in one compilatio...