April 2016
Intermediate to advanced
712 pages
18h 34m
English
Content preview from Relational Database Design and Implementation, 4th Edition
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Chapter 20
Data Modification
Abstract
This chapter covers SQL statements for inserting, modifying, and deleting data. It includes a discussion of the effect of deleting data on referential integrity, as well as merging data (updating on a condition).
Keywords
SQL
SQL INSERT
SQL UPDATE
SQL DELETE
SQL MERGE
SQL data modification
SQL includes commands for modifying the data in tables: INSERT, UPDATE, and DELETE. In many business environments, application programs provide forms-driven data modification, removing the need for end users to issue SQL data modification statements directly to the DBMS. (As you will see, this is a good thing because using SQL data modification statements are rather clumsy.) Nonetheless, if you are developing and testing database ...
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