By Donald Bales
Get began with PL/SQL, the integrated language that each Oracle developer and database administrator needs to understand, in starting PL/SQL , a fast moving and example-filled instructional. study from writer Don Bales wide event to find the main known elements of PL/SQL with out losing time with imprecise and out of date positive aspects.
Author Don Bales takes his 20+ years of expertise and a wealth of data he is collected on PL/SQL utilization over these years and applies the 80/20 rule &emdash; conceal whats so much wanted and utilized by PL/SQL execs and keep away from whats now not valuable! the result's a ebook that covers all of the key good points of PL/SQL with out squandering precious time discussing esoteric and out of date components of the language. examine what relatively issues, that you can get to paintings feeling convinced with what you recognize approximately PL/SQL.
- Discover the 20% of PL/SQL that offers you eighty% of the bangkey themes lined contain variables and datatypes, executing statements, operating with cursors, real-world gadgets, debugging, trying out, and more.
- Learn tips on how to write production-level, object-oriented PL/SQLyoull discover relational PL/SQL, yet not like such a lot different books at the topic, Don Bales emphasizes using PL/SQLs object-oriented beneficial properties as well.
- Work via actual examples of utilizing of PL/SQLyoull research PL/SQL by way of using it to real-world enterprise difficulties, now not by way of heavy theory.
What youll learn
- How very important SQL is in PL/SQL
- How to exploit PL/SQL in either a relational and object-relational setting
- How to create maintainable, modular, and reusable PL/SQL software units
- The value of trying out as you pass, and of establishing an everlasting try plan for every module
- The significance of establishing debugging services into your code and development an everlasting debug facility for every module
- The value of documenting as you move, and within the strategy development an everlasting documentation set on your reusable modules
- How to use modular PL/SQL to unravel real-world problems
Who is that this publication for?
Anyone who desires to how you can create kept systems opposed to an Oracle database utilizing PL/SQL. Programmers constructing purposes to be deployed opposed to an Oracle database will desire PL/SQL to take complete good thing about the ability Oracle has to provide. Database directors who desire to enforce performance uncovered basically through PL/SQL package deal interfaces also will locate this e-book useful.
About the Apress starting Series
The starting sequence from Apress is the ideal option to get the data you must land that an important entry-level activity. those books will train you a regular and significant know-how from the floor up simply because they're explicitly designed to take you from ''novice to professional.'' Youll commence your trip by way of seeing what you want to knowbut with no unnecessary concept and filler. Youll construct your ability set through studying the best way to prepare real-world tasks step-by-step. So even if your target is your subsequent profession problem or a brand new studying chance, the start sequence from Apress will take you thereit is your relied on advisor via unusual territory!
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Extra info for Beginning PL/SQL: From Novice to Professional
Now you can do the same for the publication table. So please update the publication titles to uppercase. 1. Write the DML script. 2. upd extension. 3. Execute your script in SQL*Plus. fm Page 20 Tuesday, July 17, 2007 3:47 AM 20 CHAPTER 1 ■ GEN ESIS The titles in the publication table should be in uppercase—good job. Listing 1-19 shows how I fixed this mistake. Listing 1-19. ups 1 2 3 4 5 UPDATE publication SET title = upper(title) WHERE title <> upper(title); COMMIT; UPDATE statements can be quite complex.
However, a foreign key constraint is defined against a dependent, or child, table. So what’s a dependent or child table? Well, in our example, we know that the publication table is dependent on, or points to, the author table. So we’ll need to define a foreign key constraint against the publication table, not the author table. The foreign key constraint is represented by the relation (line with crow’s feet) in the ERD in Figure 1-1. fm Page 9 Tuesday, July 17, 2007 3:47 AM C HA PTER 1 ■ G ENES IS Listing 1-8 shows the DDL to create a foreign key constraint against the publication table that defines its relationship with the author table in the database.
2. ndx extension. 3. Execute your script in SQL*Plus by typing an at sign (@) followed by the filename at the SQL> prompt. You should now have a non-unique index in the database, just waiting for you to query against it. If not, try to make some sense out of the error message(s) you got, correct your script, and then try again. My shot at this is shown in Listing 1-4. fm Page 7 Tuesday, July 17, 2007 3:47 AM C HA PTER 1 ■ G ENES IS Listing 1-4. ndx 1 2 3 CREATE INDEX publication_k1 on publication ( title ); Now you know how to create a table and an index or two to make accessing it efficient, but what prevents someone from entering bad data Well, that’s what constrains are for.
Beginning PL/SQL: From Novice to Professional by Donald Bales