March 2001
Intermediate to advanced
640 pages
14h 9m
English
book
Sams Teach Yourself Transact-SQL in 21 Days, Second Edition
by Lowell Mauer, David Solomon, Bennett McEwan
Content preview from Sams Teach Yourself Transact-SQL in 21 Days, Second Edition
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Day 6
Quiz
| 1: | How many tables can appear in a single query? |
| A1: | In previous releases of SQL Server, there was a limit of 16 tables. However, Microsoft has increased this limit to 256, which is probably more than any query you write will ever need. |
| 2: | Can a subquery be run as a join or vice versa? |
| A2: | Yes, in most cases, a subquery can be implemented as a join or vice versa. |
| 3: | In which SQL clauses may a subquery appear? |
| A3: | A subquery can be used in any SELECT, WHERE, and HAVING statement or clause. |
Exercises
These exercises use the Pubs database.
| 1: | List the authors who have at least one book priced above the average price. |
| A1: | This one is a bit harder than it looks. To answer it, you must use the Authors table to get the author names, the Sales table ... |
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.