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The cursor declaration defines the SELECT statement that retrieves data from the database, and cursor-related statements are then used to retrieve the individual rows from that result set (For more information about cursors, see 15) Cursors, then, provide a solution to one type of impedance mismatch that can occur between SQL and the host language Specifically, SQL returns data in sets, and most programming languages cannot handle sets By using some sort of looping construct within the programming language and then using the SQL FETCH statement, you can cycle through each row in the result set to retrieve the data that you need Despite the availability of cursors to embedded SQL, there are often times when you know that your database query will return only one row For example, you might want to retrieve data about a specific CD or performing artist, in which case, a cursor is unnecessary.

To facilitate single-row retrievals, embedded SQL supports the singleton SELECT statement A singleton SELECT statement is similar to a regular SELECT statement except in two ways:.

Describe the type of backup (full, incremental, differential, or copy). Clearly indicate the contents of all backup media.

Here is the general syntax of the cursor DELETE statement, followed by an example:

You do not include a GROUP BY, HAVING, or ORDER BY clause. You include an INTO clause that specifies the host variables that will receive the data returned by the SELECT statement to the host program.

Alternatively, you may choose to use a sequential logging scheme, where all tapes are numbered (or are otherwise uniquely identified) and a separate log is kept describing their contents. Either way, it s important that you keep operations organized. Regular testing of your backup and restoration procedures will help you refine your media organization scheme.

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For example, suppose your SELECT statement returns the name of the CD and the number in stock, as shown in the following embedded statement:

EXEC SQL SELECT INTO FROM WHERE CD_NAME, IN_STOCK :v_CD_NAME, :v_IN_STOCK CD_INVENTORY CD_ID = :v_CD_ID;

A clearly defined set of policies for information technology resource usage can go a long way toward telling users what to expect This works in both directions First, it is very important to communicate to users what is expected from them Information outlining disk quotas, server storage areas, and Internet usage policies are all very important pieces of information However, the second part of this equation the part that is often overlooked is to notify users regarding what to expect from IT staff No one likes to be told what to do, so it is important to involve users and managers from other departments, as well as system, database, and network administrators.

DELETE FROM table_name WHERE CURRENT OF cursor_name; DELETE FROM MOVIE_RENTAL WHERE CURRENT OF overdue_rentals;

As you can see in this statement, the v_CD_ID variable is used to specify which CD should be returned. The value is entered by the user, and the variable passes that value from the host program into the SELECT statement. Now let s take a look at the INTO clause. Notice that the clause contains two variables, the same number of variables as the number of columns retrieved from the CD_INVENTORY table. These variables are declared in the same way as the other host variables that we ve seen. Because this SELECT statement returns only one row and two columns, only two values are returned. These values are transferred to the variables. The variables must be specified in the same order as the column names are specified.

The v_CD_ID variable in the WHERE clause is an input host variable, and the v_CD_ NAME and v_IN_STOCK variables in the INTO clause are output host variables. The only difference is in how they are used by the SQL statement they are defined in exactly the same manner within the host language.

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