Answer:
"this" keyword representing the class object itself.
Explanation:
Object-oriented programming concept emphasizes on using blueprints representing the structure of a data collection type to continuously create an instance of that data structure. The instance of that object is called a class object. It is used in database management systems to populate the database.
Functions defined in the class objects are called methods and are used specifically by the class instance to modify the data content of the class object defined.
When a member of a class is referenced in the class, it can be accessed with the "this" keyword. At an instance of the class object, the variable holding the object should be called to get the class content because of the "this" keyword binding the instance of the object to the method.
Answer:
Check the explanation
Explanation:
use `my_guitar_shop`;
#delete the procedure test if it exists.
DROP PROCEDURE IF EXISTS test;
DELIMITER //
CREATE PROCEDURE test ()
BEGIN
#declare variable sqlerr to store if there is an sql exception
declare sqlerr tinyint default false;
#declare variable handler to flag when duplicate value is inserted
declare continue handler for 1062 set sqlerr = TRUE;
#start transaction
start transaction;
delete from order_items where order_id in
(select order_id from orders where customer_id=6);
delete from orders where customer_id=6;
delete from addresses where customer_id=6;
delete from customers where customer_id=6;
if sqlerr=FALSE then
commit;
select 'Transaction Committed' as msg;
else
rollback;
select 'Transaction rollbacked' as msg;
end if;
end //
delimiter ;
call test();
Answer:
Explanation:
To resolve this problem, first, we need the current date and a pass day, with these two values, we're going to use the formula called "DAYS" this formula returns the numbers of day between two dates, when we get the number of days, only we must multiply the result by 24, in this case, this represents the 24 hours in a day.
Answer:
It stands for Restriction of Certain Hazardous Substances.
Web search says it is important because,
RoHS compliance dovetails into WEEE by reducing the amount of hazardous chemicals used in electronic manufacture. Put another way, RoHS regulates the hazardous substances used in electrical and electronic equipment, while WEEE regulates the disposal of this same equipment.
Explanation:
Answer:
Windows Server 2008 R2
Explanation:
The Windows Server 2008 R2 is a window server operating system that was developed by Microsoft. The server was developed on the enhancement of the Window Server 2008. This type of window server came with different improvements and benefits (such as power consumption) over the previous window servers in the market.
