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The following exercises will help you to better understand the concepts described in this chapter. The answers are presented in Appendix D. 1. 2. 3. Listing 7-5 defines the constraint E_SALES_CHK in a rather cryptic way. Formulate the same constraint without using DECODE and NVL2. Why do you think the constraint E_DEPT_FK (in Listing 7-7) is created with a separate ALTER TABLE command Although this is not covered in this chapter, try to come up with an explanation of the following phenomenon: when using sequences, you cannot use the pseudo column CURRVAL in your session without first calling the pseudo column NEXTVAL: SQL> select deptno_seq.currval from dual; select deptno_seq.currval from dual * ERROR at line 1: ORA-08002: sequence DEPTNO_SEQ.CURRVAL is not yet defined in this session SQL> 4. 5. 6. Why is it better to use sequences in a multiuser environment, as opposed to maintaining a secondary table with the last/current sequence values How is it possible that the EVALUATION column of the REGISTRATIONS table accepts null values, in spite of the constraint R_EVAL_CHK (see Listing 7-11) If you define a PRIMARY KEY or UNIQUE constraint, the Oracle DBMS normally creates a unique index under the covers (if none of the existing indexes can be used) to check the constraint. Investigate and explain what happens if you define such a constraint as DEFERRABLE. You can use function-based indexes to implement conditional uniqueness constraints. Create a unique function-based index on the REGISTRATIONS table to check the following constraint: employees are allowed to attend the OAU course only once. They may attend other courses as many times as they like. Test your solution with the following command (it should fail): SQL> insert into registrations values (7900,'OAU',trunc(sysdate),null); Hint: You can use a CASE expression in the index expression.

Figure 10-8. The Print tab of the Print documents dialog Total, First, and Last text fields: The Total text field displays the number of document records that are accessible to the report. Note that the number that appears here depends on the number of document records available to Concordance from the last active search. However, you can narrow the number of records that are output by entering values in the First and Last text fields. Save print file : Saves the current formatting selections you made to a file that can be later recalled by clicking the Open an existing print file button. This can save time when printing the same types of reports between Concordance sessions. The formatting profile is saved as a file with an .FMT extension. It s stored in a raw text format, and can be opened and modified using a text editor. Change the font : Selects the font to be used in the report. However, this selection is subordinate to any font modifications made to Concordance directly via Browse view.

This chapter resumes the discussion of the retrieval possibilities of the SQL language It is a logical continuation of s 4 and 5 The first section introduces the concept of row or tuple variables We did not discuss them so far, because we haven t needed them up to now By the way, most SQL textbooks don t mention tuple variables at all at least not the way this book does When you start specifying multiple tables in the FROM clause of your SELECT statements, it is a good idea to start using tuple variables (also referred to as table aliases in Oracle) in a consistent way Section 82 explains joins, which specify a comma-separated list of table names in the FROM clause and filter the desired row combinations with the WHERE clause Section 8.