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The DECLARE CURSOR statement, shown in Figure 17-24, defines a query to be performed. The statement also associates a cursor name with the query. The cursor name must be a valid SQL identifier. It is used to identify the query and its results in other embedded SQL statements. The cursor name is specifically not a host language variable; it is declared by the DECLARE CURSOR statement, not in a host language declaration. The SELECT statement in the DECLARE CURSOR statement defines the query associated with the cursor. The SELECT statement can be any valid interactive SQL SELECT statement, as described in s 6 through 9. In particular, the SELECT statement must include a FROM clause and may optionally include WHERE, GROUP BY, HAVING, and ORDER BY clauses. The SELECT statement may also include the UNION operator, as described in 6. Thus, an embedded SQL query can use any of the query capabilities that are available in the interactive SQL. The query specified in the DECLARE CURSOR statement may also include input host variables. These host variables perform exactly the same function as in the embedded INSERT, DELETE, UPDATE, and singleton SELECT statements. An input host variable can appear within the query anywhere that a constant can appear. Note that output host variables cannot appear in the query. Unlike the singleton SELECT statement, the SELECT statement within the DECLARE CURSOR statement has no INTO clause and does not retrieve any data. The INTO clause appears as part of the FETCH statement, described shortly.

atabase management systems organize and structure data so that it can be retrieved and manipulated by users and application programs. The data structures and access techniques provided by a particular DBMS are called its data model. A data model determines both the personality of a DBMS and the applications for which it is particularly well suited. SQL is a database language for relational databases that uses the relational data model. What exactly is a relational database How is data stored in a relational database How do relational databases compare to earlier technologies, such as hierarchical and network databases What are the advantages and disadvantages of the relational model This chapter describes the relational data model supported by SQL and compares it to earlier strategies for database organization.

FIGURE 17-24

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As database management became popular during the 1970s and 1980s, a handful of popular data models emerged. Each of these early data models had advantages and disadvantages that played key roles in the development of the relational data model. In many ways, the relational data model represented an attempt to streamline and simplify the earlier data models. To understand the role and contribution of SQL and the relational model, it is useful to briefly examine some data models that preceded the development of SQL.

All three of the relationships in the cycle specify the RESTRICT delete rule Note that George's row is the only row you can delete from the three tables Every other row is the parent in some relationship and is therefore protected from deletion by the RESTRICT rule Because of this anomaly, you should not specify the RESTRICT rule for all of the relationships in a referential cycle..

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