By Donald Bales
Beginning Oracle PL/SQL will get you began in utilizing the integrated language that each Oracle developer and database administrator needs to recognize. Oracle Database is brim-full of integrated program positive factors which are unfastened for the utilizing, and PL/SQL is your price ticket to studying approximately and utilizing these gains out of your personal code. With it, you could centralize enterprise good judgment within the database, you could offload program good judgment, and you'll automate database- and application-administration initiatives.
Author Don Bales offers in Beginning Oracle PL/SQL a fast paced and example-filled educational. study from Don’s huge adventure to find the main conventional elements of PL/SQL, with no losing time on imprecise and out of date beneficial properties.
The writer takes his 20+ years of expertise and a wealth of facts he is accumulated on PL/SQL utilization over these years and applies the 80/20 rule: hide what is such a lot wanted and utilized by PL/SQL pros and steer clear of what is no longer beneficial! the result's a booklet that covers the entire key gains of PL/SQL with out squandering precious time discussing esoteric and out of date components of the language. research what fairly issues, that you should get to paintings feeling convinced with what you recognize approximately PL/SQL.
- Covers the major themes that subject, together with variables and datatypes, executing statements, operating with cursors, bulk operations, real-world gadgets, debugging, trying out, and more.
- Teaches you to jot down production-level, object-oriented PL/SQL. you will discover relational PL/SQL, yet in contrast to such a lot different books at the topic, this one emphasizes using PL/SQLs object-oriented gains as well.
- Guides you in operating via genuine examples of utilizing of PL/SQL. you are going to research PL/SQL through making use of it to real-world enterprise difficulties, no longer by means of heavy theory.
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Lines 17 through 20 contain the DDL to alter the table in order to add a primary key constraint. • Lines 22 through 25 contain the DDL to alter the table in order to add a unique key constraint. This constraint will allow only unique code values in the code table. Since it’s a code table, I can seed it with some initial values. I’ve written a second script for that, shown in Listing 1-27. Listing 1-27. ins rem by Donald J. gather_table_stats(USER, 'WORKER_TYPES'); Here’s what’s happening in Listing 1-27: • In lines 1 through 3, I’ve added the author and written date.
This time, insert the publications for Date and Darwen, but use the conditional INSERT SELECT syntax with detection for Darwen’s publications. 1. ins. 2. Write the DML scripts to insert the publications by Date and Darwen from Table 1-2. 3. ins extension to both files. 4. Execute your scripts in SQL*Plus by typing an at sign (@) followed by the file name at the SQL> prompt. The author_publications table should now have eight rows. And, if you run the Darwen script again, you won’t get any duplicate-value errors, because the SQL detects whether Darwen’s entries already exist in the database.
If you had difficulty writing the queries for these two exercises, then you need more experience with SQL queries before you can be proficient with PL/SQL. You’ll be able to learn and use PL/SQL, but you’ll be handicapped by your SQL skills. In fact, everything we just covered should have been a review for you. If any of it was new, I recommend that you follow up learning PL/SQL with some additional training in SQL. As I said when we started on this journey together, you need to know SQL really well, because it makes up about 25% of every PL/SQL stored procedure.