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and then loop through them to display space information to users. 8. Create a stored procedure that lists orders scheduled for today with a status set to 1. 9. Create a stored procedure that lists orders and displays three character abbreviations of order status and type (that is, Ordered Ord, Canceled Cnl, Deferred Dfr, and so on). 10. Create a stored procedure that will return a recordset with the field names of the specified table. The stored procedure should have only one input parameter table name. 11. Explain the problems associated with the use of cursors. 12. Stored procedure sp_spaceused can return information about the space used by a database object. Collect the names of all tables in the Asset database using

Unlike primary keys, foreign keys in a relational database are allowed to contain NULL values. In the sample database the foreign key REP_OFFICE, in the SALESREPS table, permits NULL values. In fact, this column does contain a NULL value in Tom Snyder's

select name from sysobjects where xtype = 'U'

receive capabilities, but without the controller of a conventional modem. The MX604 contains an FSK modulator and demodulator as well as filters, buffers, and timing and logic control functions. The diagram in Fig. 21-5 illustrates the block diagram of the of the MX604 modem chip. The MX604 pinout diagram is shown in Fig. 21-6, and Table 21-2 depicts the pinout list for the MX604.

Use a cursor to loop through the table names to display space information to users. This exercise is equivalent to exercise 7. Compare the solutions. 13. Create two stored procedures that will return a resultset in the form of a denormalized Inventory table (see Figure 4-3). All fields in the Inventory table that are links to other lookup tables should be replaced with values from those lookup tables. Each stored procedure should use a different method to obtain information:

- 225 -

Figure 4-3.

Xtal Osc and clock dividers Energy detect Mode control logic Receive filter and equalizer VBIAS Transmit filter and output buffer FSK demodulator Rx/Tx Data Re-timing FSK modulator

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icrosoft has done a fantastic job providing database administrators with an extensive and coherent set of built-in functions for SQL Server. Users of SQL Server 2000 are now also able to create their own functions. We will cover the design of user-defined functions in 9 and focus here on the use and attributes of built-in functions.

row, because Tom has not yet been assigned to an office But the NULL value poses an interesting question about the referential integrity constraint created by the primary key/foreign key relationship Does the NULL value match one of the primary key values or doesn't it The answer is "maybe" it depends on the "real" value of the missing or unknown data Both DB2 and the ANSI/ISO SQL1 standard automatically assume that a foreign key that contains a NULL value satisfies the referential integrity constraint In other words, they give the row "the benefit of the doubt" and allow it to be part of the child table, even though its foreign key value doesn't match any row in the parent table Interestingly, the referential integrity constraint is assumed to be satisfied if any part of the foreign key has a NULL value.

1 2 3 4 5 6 7 8

Functions are Transact-SQL syntax elements that are used to evaluate a list of parameters and return a single value to the caller. The usual syntax for calling a function is

Function_name ([parameter] [,...n])

This can produce unexpected and unintuitive behavior for compound foreign keys, such as the one that links the ORDERS table to the PRODUCTS table Suppose for a moment that the ORDERS table in the sample database permitted NULL values for the PRODUCT column, and that the PRODUCTS/ORDERS relationship had a SET NULL delete rule (This is not the actual structure of the sample database, for the reasons illustrated by this example) An order for a product with a manufacturer id (MFR) of ABC and a NULL product id (PRODUCT) can be successfully inserted into the ORDERS table because of the NULL value in the PRODUCT column DB2 and the ANSI/ISO standard assume that the row meets the referential integrity constraint for ORDERS and PRODUCTS, even though no product in the PRODUCTS table has a manufacturer id of ABC The SET NULL delete rule can produce a similar effect.

For example, a sine function has the following syntax: