What is the difference between an implicit and user-defined database constraint?
What will be an ideal response?
Implicit constraints are rules that every relational database must satisfy in order to be valid. User-defined constraints are added by the database designer and they are specific for each database.
Business
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Bar codes are read by computerized optical scanners that match codes with brand names, package sizes, and prices
Indicate whether the statement is true or false a. True b. False
Business
The high failure rate of new products shows that companies are not able to ________
A) control demand B) advertise enough C) understand international laws D) find outlets E) identify consumer needs
Business