May 2018
Intermediate to advanced
392 pages
10h 22m
English
Content preview from Practical SQL
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3UNDERSTANDING DATA TYPES
Whenever I dig into a new database, I check the data type specified for each column in each table. If I’m lucky, I can get my hands on a data dictionary: a document that lists each column; specifies whether it’s a number, character, or other type; and explains the column values. Unfortunately, many organizations don’t create and maintain good documentation, so it’s not unusual to hear, “We don’t have a data dictionary.” In that case, I try to learn by inspecting the table structures in pgAdmin.
It’s important to understand data types because storing data in the appropriate format is fundamental to building usable databases ...
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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.