September 2010
Intermediate to advanced
440 pages
9h 23m
English
Content preview from MySQL for PythonBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Summary
In this chapter, we have covered how to use HAVING clauses, subqueries, and joins in Python. We have also seen:
- How to restrict results using
HAVING - How
HAVINGdiffers fromWHERE - When it is best to use the following—
WHEREorHAVING - How to narrow data even further with subqueries
- Using
UNIONto concatenate two results sets before they are returned - The various ways to join tables, including the difference between a
LEFT JOINand aRIGHT JOINas well as the differences betweenINNERjoins,OUTERjoins,NATURALjoins, andCROSSjoins
In the next chapter, we will look at several more of MySQL's powerful functions and how to use them best in Python.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.