February 2018
Intermediate to advanced
960 pages
22h 7m
English
book
SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, 4th Edition
by John L. Viescas
Content preview from SQL Queries for Mere Mortals: A Hands-On Guide to Data Manipulation in SQL, 4th Edition
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19Condition Testing
“The only real mistake is the one from which we learn nothing.”
—JOHN POWELL
Topics Covered in This Chapter
You might remember that way back in Chapter 4, “Creating a Simple Query,” I explained the difference between data and information. You store data in the rows and columns in your tables, but you often need a query to turn that data into useful information. Sometimes, turning data into information requires you to perform complex calculations or transformations of your data to get what you want. It could be something as simple as formatting a salutation for the name line of address labels. Or, you might need to ...
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I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.