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Explain the Check Clause
The CHECK clause is employed to at the end of a CREATE TABLE statement specify table constraints. This is known as table-based constraint because it applies to every tuple individually and is checked when a tuple is inserted or modified.
The CHECK clause can as well be used to fixed more general constraints by using the CREATE ASSERTION statement of SQL.
Replication : It is definite as a copy of a relation. Every replica is stored at a dissimilar site. The alternative to replication is to store only single copy of a relation which
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
how oracle can be used
Write a program within embedded SQL to associative the total trip expenses of the salesman named ‘John' for the relations. EXEC SQL BEGIN DECLARE SECTION; long total_expenses;
Attributes having a one value for a particular entity. For instance, Age is a single valued attribute of a student entity. Attributes that have more than single values
What is the use of with clause in SQL? The with clause gives a way of defining a temporary view whose explanation is available only to the query in which the with clause occurs
In a job interview with a branch manager of a bank that operates in multiple Canadian provinces and the Yukon, you learn that all of the information is captured in real time in a s
Identify the need and use of data control through problem solving, illustration
What is the way a particular application views the data from the database that the application uses? Sub schema is the way a particular application views the data from the data
Explain P command in the respect of QBE? P: It is the command in which is used to print (logically display) the value of the attribute in whose cell it is writ
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