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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. java code 128 library Java Code 128 Generator | Barcode Code128 Generation in Java ...
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The following Java code can help Java developers generate & create Code 128 barcode in Java class. Using this Java Code 128 barcoding control, you can easily & quickly integrate Code 128 barcode generating function into your Java Servlet class project. 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. Unless your display space is at a premium, this is a purely aesthetic judgment and you can make it accordingly. In this, as in many other areas, the fact that a convention exists is more important than the convention s specific details. For details on documenting routines, see Commenting Routines in Section 32.5. For details on the process of writing a routine, see Section 9.3, Constructing Routines Using the PPP. For a discussion of the differences between good and bad routines, see 7, High-Quality Routines. 7 3 shows the ANSI/ISO standard syntax to produce joins (supported since Oracle9i), and Section 84 goes into more details about outer joins In large information systems (containing huge amounts of detailed information), it is quite common to be interested in aggregated (condensed) information For example, you may want to get a course overview for a specific year, showing the number of attendees per course, with the average evaluation scores You can formulate the underlying queries you need for such reports by using the GROUP BY clause of the SELECT command Group functions (such as COUNT, AVG, MIN, and MAX) play an important role in such queries If you have aggregated your data with a GROUP BY clause, you can optionally use the HAVING clause to filter query results at the group level Topics surrounding basic aggregation are covered in Sections 85, 86, and 87 Section 8. java code 128 checksum Code 128 Java Barcode Generator/Library Freeware - TarCode.com
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