June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL Antipatterns
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Chapter 10Rounding Errors
10.0 times 0.1 is hardly ever 1.0.
Brian Kernighan
Your boss asks you to produce a report of the cost of programmer time for the project, based on the total work to fix each bug. Each programmer in the Accounts table has a different hourly rate, so you record the number of hours required to fix each bug in the Bugs table, and you multiply it by the hourly_rate of the programmer assigned to do the work.
| Rounding-Errors/intro/cost-per-bug.sql | |
| | SELECT b.bug_id, b.hours * a.hourly_rate AS cost_per_bug |
| | FROM Bugs AS b |
| | JOIN Accounts AS a ON (b.assigned_to = a.account_id); |
To support this query, you need to create new columns in the Bugs and Accounts tables. Both columns should support fractional values, ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.