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Just as the delete rule tells the DBMS what to do when a user tries to delete a row of the parent table, the update rule tells the DBMS what to do when a user tries to update the value of one of the primary key columns in the parent table Again, there are four possibilities, paralleling those available for delete rules: The RESTRICT update rule prevents you from updating the primary key of a row in the parent table if that row has any children An UPDATE statement that attempts to modify the primary key of such a parent row is rejected with an error message Changes to primary keys in the parent table are thus restricted to rows without any children Applied to Figure 11-1, this rule can be summarized as "You can't change an office number if salespeople are assigned to the office.

Create Procedure GetInventoryProperties /* Return comma-delimited list of properties that are describing asset. i.e.: Property = Value Unit;Property = Value Unit;Property = Value Unit;Property = Value Unit;Property = Value Unit;... */ ( @intInventoryId int, @chvProperties varchar(8000) OUTPUT ) As declare @intCountProperties int, @intCounter int, @chvProperty varchar(50), @chvValue varchar(50), @chvUnit varchar(50) Create table #Properties( Id int identity(1,1), Property varchar(50), Value varchar(50), Unit varchar(50)) -- identify Properties associated with asset insert into #Properties (Property, Value, Unit) select Property, Value, Unit from InventoryProperty inner join Property on InventoryProperty.PropertyId = Property.PropertyId where InventoryProperty.InventoryId = @intInventoryId -- set loop select @intCountProperties = Count(*), @intCounter = 1, @chvProperties = '' from #Properties -- loop through list of properties while @intCounter <= @intCountProperties

few resistors, and a diode are all that are needed to use the processor in its most simple form The 28-pin PIC 16C57 is a very capable and versatile little microprocessor that can perform many tasks In order to turn the BS2 look-alike into a Data-Alert project, a few more parts must be added to the basic configuration First, you need to configure pins 10 through 17 as inputs, for a total of eight inputs, that can be used to sense events or alarm conditions The first four input pins are brought out to the terminal block for easy access These first four inputs, IN1 through IN4, are used as inputs to the microprocessor The second four input pins are IN5 through IN8; note the resistors placed across each of the input pins Pins 18 through 25 are configured as output pins.

begin -- get one property select @chvProperty = Property, @chvValue = Value, @chvUnit = Unit from #Properties where Id = @intCounter -- assemble list set @chvProperties = @chvProperties + '; ' + @chvProperty + '=' + @chvValue + ' ' + @chvUnit

" The CASCADE update rule tells the DBMS that when a primary key value is changed in a parent row, the corresponding foreign key value in all of its child rows should also automatically be changed in the child table, to match the new primary key For Figure 11-1, this rule can be summarized as "Changing an office number automatically changes the office number for all the salespeople assigned to that office" The SET NULL update rule tells the DBMS that when a primary key value in a parent row is updated, the foreign key values in all of its child rows should automatically be set to NULL Primary key changes in the parent table thus cause a "set to NULL" update on selected columns of the child table.

-- let's go another round and get another property set @intCounter = @intCounter + 1 end drop table #Properties return 0

The GoTo statement forces the server to continue the execution from a label:

Pin 19 is used to drive the solid-state relay at U4 The microprocessor activates the LED in U4, which in turn closes the relay contacts at pins 4 and 6 of the relay, essentially shorting out blocking capacitor C11 and allowing the phone to go on hook and begin dialing your cell phone or pager Pins 20 and 21 of U1 are audio output pins Pin 20 of U1 outputs the touch-tone signals needed to dial the phone when an alarm condition is sensed, while pin 21 is used to output the tone sequences that are used to indicate via your cell phone which event/alarm channel has been activated The capacitors at C9 and C10 are used to couple the touch-tones and the alarm sequence tones to the coupling transformer network formed by T1 and the associated components.

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