By Donald Bales
Starting Oracle PL/SQL will get you all started in utilizing the integrated language that each Oracle developer and database administrator needs to recognize. Oracle Database is brim-full of integrated software gains which are loose for the utilizing, and PL/SQL is your price ticket to studying approximately and utilizing these positive aspects out of your personal code. With it, you could centralize enterprise common sense within the database, you could offload program common sense, and you'll automate database- and application-administration projects. writer Don Bales presents in starting Oracle PL/SQL a fast moving and example-filled educational. examine from Don's large event to find the main prevalent elements of PL/SQL, with out losing time on imprecise and out of date beneficial properties.
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Additional resources for Beginning Oracle PL/SQL, 2nd Edition
So please update the publication titles to uppercase. 1. Write the DML script. 2. upd extension. 3. Execute your script in SQL*Plus. The titles in the author_publications table should now be in uppercase—good job. Listing 1-19 shows how I fixed this mistake. Listing 1-19. upd 1 2 3 4 5 UPDATE author_publications SET title = upper(title) WHERE title <> upper(title); COMMIT; UPDATE statements can be quite complex. They can pull data values from other tables, for each column, or for multiple columns using subqueries.
Subquery_column_name_2>, ... ; Yes! You can update multiple columns at the same time simply by grouping them with parentheses. The moral of the story is, don’t use PL/SQL to do something you can already do with SQL. I’ll be harping on this moral throughout the book, so if you didn’t get my point, relax, you’ll hear it again and again in the coming chapters. Delete In practice, data is rarely deleted from a relational database when compared to how much is input, updated, and queried. Regardless, you should know how to delete data.
This improves flexibility. Think of the WORKER_TYPES, GENDER_TYPES, WORKPLACE_TYPES, and HAZARD_LEVEL_TYPES tables as code tables. They all have a similar set of behaviors that you will later make accessible with PL/SQL functions and procedures. info Chapter 1 ■ Relational SQL Intersections hired Think of intersections as a means of documenting history. Understanding that there is a history of information is the single-most portion missing in the analyses of business problems. Most often, a manyto-many relationship table (an intersection) will be created that captures only the “current” relationship between content entities, but there’s always a history, and the history is almost always what’s actually needed to solve the business problem in question.
Beginning Oracle PL/SQL, 2nd Edition by Donald Bales