December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 15
Table Operations
Abstract
SQL is tiered and some operations work at that level.
Keywords
BEGIN ATOMIC
Bulk load
COMMIT
CURRENT OF < cursor name >
DELETE FROM statement
ELSE
INSERT INTO statement
MERGE statement
Redundant duplicates
ROLLBACK
ROWID
SET
THEN
UPDATE statement
USING
WHEN [NOT] MATCHED
WHERE
There are only four things you can do with a set of rows in an SQL table: insert them into a table, delete them from a table, update the values in their rows, or query them. The unit of work is a set of whole rows inside a base table.
When you worked with file systems, access was one record at a time, then one field within a record. As you had repeated groups and other forms of variant records, you could change the structure of ...
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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.