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Keyset-driven: Only updated data can be viewed, deleted and inserted data cannot be viewed.Constraint SQL Constraints SQL constraints are used to specify rules for the data in a table.SQL CREATE TABLE CONSTRAINT Syntax: CREATE TABLE table_name(column_name1 data_type(size) constraint_name,column_name2 data_type(size) constraint_name,column_name3 data_type(size) constraint_name,....); In SQL, we have the following constraints:6.What are the differences among foreign, primary, and unique keys While unique and primary keys both enforce uniqueness on the column(s) of one table, foreign keys define a relationship between two tables.Cursors, therefore, serve as a mechanism for applications to operate on a single row or a set of rows.
Examplepublic delegate int Delegate Method(int x, int y); Any method that matches the delegate's signature, that consists of the return type and parameters, can be assigned to the delegate.String Builder and String class String A string is a sequential collection of Unicode characters that represent text. Concat method concatenates one or more instances of a String. Write Line (string1); string string2 = "Hi " "This is Jitendra ";string2 = "Sampathi Rao."; Console. Every time you use one of the methods in the System. String Builder class can be used when you want to modify a string without creating a new object. While coding, we look for classes that can reduce manual operation.String is a class that belongs to the namespace System. String concatenation can be done using the ' ' opearator or the String. Sample code string string1 = "Today is " Date Time. Write Line(string2); String Builder String Builder is a class that belongs to the namespace System. String class, you create a new string object in memory, that requires a new allocation of space for that new object. For example, using the String Builder class can boost performance when concatenating many strings together in a loop. What is the difference between array and array list? For instance if you want to sort the values in an array then you need to do the manual operations.This ability to refer to a method as a parameter makes delegates ideal for defining callback methods.Delegate magic In a class we create its object, that is an instance, but in a delegate when we create an instance it is also referred to as a delegate (in other words whatever you do, you will get a delegate). Singlecast delegate a Singlecast delegate points to a single method at a time. Multicast Delegate When a delegate is wrapped with more than one method then that is known as a multicast delegate. There are three steps in defining and using delegates: 1.
The main advantage of cursors is that you can process data row-by-row.