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Use a database schema with the seven case tables (see Appendix C of this book) to perform the following exercises. The answers are presented in Appendix D. 1. For all employees, provide their last name, a comma, followed by their initials. 2. For all employees, list their last name and date of birth, in a format such as April 2nd, 1967. 3. On which day are (or were) you exactly 10,000 days old On which day of the week is (was) this 4. Rewrite the example in Listing 5-23 using the NVL2 function. 5. Rewrite the example in Listing 5-24 to remove the DECODE functions using CASE expressions, both in the SELECT clause and in the ORDER BY clause. 6. Rewrite the example in Listing 5-20 using DATE and INTERVAL constants, in such a way that they become independent of the NLS_DATE_FORMAT setting. 7. Investigate the difference between the date formats WW and IW (week number and ISO week number) using an arbitrary date, and explain your findings. 8. Look at Listing 5-15, where we use the REGEXP_INSTR function to search for words. Rewrite this query using REGEXP_LIKE. Hint: You can use {n,} to express at least n times.

Note The important user who is created here is K/M@EXAMPLE.COM. Do not, when poking through your database

Figure 7 10. These files are needed to get SneakyInput to work in your own project; the other files are only used for example code.

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n this chapter, you will learn how to change the contents of an Oracle database. The SQL commands to change the database contents are commonly referred to as Data Manipulation Language (DML) commands. The first four sections of this chapter cover the DML commands INSERT, UPDATE, DELETE, and MERGE. The first three commands have names that are self-explanatory. The fourth one, MERGE, allows you to perform a mixture of insertions, updates, and deletions in a single statement, which is especially useful in data warehousing environments. In production environments, especially when dealing with high-volume transactions, data manipulation is mostly performed via database applications. In general, these database applications are built (or generated) with application development tools such as Oracle Forms and Oracle JDeveloper. Such applications offer a pleasant user-friendly interface to the database; however, they still use the basic INSERT, UPDATE, and DELETE commands under the hood to communicate with the database, so you should understand how these commands work. Additionally, sometimes manual data manipulation via SQL*Plus can be very efficient. For example, you may want to perform global updates (such as to change a certain column for all rows of a table at the same time) or to remove all rows of a table. Section 6.5 explains the concept of transactions and introduces three transaction-related SQL commands: COMMIT, SAVEPOINT, and ROLLBACK. This chapter is also the most obvious place in this book to pay some attention to read consistency and locking. So, the last section discusses how the Oracle DBMS guarantees transaction isolation in a multiuser environment. It provides an introduction to the concepts involved, without going into too many technical details.

at a later stage, think that you can t remember creating this deliberately and therefore you should delete it, because that would break the database in a permanent and fairly catastrophic way.

Let s try this. With the SneakyInput source code added to the project ScrollingWithJoy05, the first goal is to add a button that allows the player to shoot bullets from the player s ship. I m going to add a separate InputLayer class to the project, which is derived from CCLayer and added to the GameScene class. In Listing 7 6, I updated the scene method to add the new InputLayer to it, and I m giving both layers a tag just in case I need to identify them later on.

You can use the INSERT command to add rows to a table. Along with the standard INSERT command, Oracle SQL also supports a multitable version.

Listing 7 6. Adding the InputLayer to the GameScene +(id) scene { CCScene* scene = [CCScene node]; GameScene* layer = [GameScene node]; [scene addChild:layer z:0 tag:GameSceneLayerTagGame]; InputLayer* inputLayer = [InputLayer node]; [scene addChild:inputLayer z:1 tag:GameSceneLayerTagInput]; return scene; }

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