June 2010
Intermediate to advanced
328 pages
7h 51m
English
Content preview from SQL AntipatternsBecome 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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Antipattern: Use FLOAT Data Type
Most programming languages support a data type for real numbers, called float or double. SQL supports a similar data type of the same name. Many programmers naturally use the SQL FLOAT data type everywhere they need fractional numeric data, because they are accustomed to programming with the float data type.
The FLOAT data type in SQL, like float in most programming languages, encodes a real number in a binary format according to the IEEE 754 standard. You need to understand some characteristics of floating-point numbers in this format to use them effectively.
Rounding by Necessity
Many programmers are not aware of a characteristic of this floating-point format: not all values you can describe in decimal can ...
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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.