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Different Syntax In Sql Full NameBegin Return
The value of the table variable should be derived from a single SELECT statement. -Create a tableInsert into Employee(EmpID,FirstName,LastName,Salary,Address) Values(1,'Mohan','Chauahn',22000,'Delhi') Insert into Employee(EmpID,FirstName,LastName,Salary,Address) Values(2,'Asif','Khan',15000,'Delhi') Insert into Employee(EmpID,FirstName,LastName,Salary,Address) Values(3,'Bhuvnesh','Shakya',19000,'Noida') Insert into Employee(EmpID,FirstName,LastName,Salary,Address) Values(4,'Deepak','Kumar',19000,'Noida') Select * from Employee -Create function to get emp full nameBegin return (Select + ' '+ -Calling the above created functionSelect dbo.fnGetEmpFullName(FirstName,LastName) as Name, Salary from Employee The user-defined inline table-valued function returns a table variable as a result of actions performed by the function. We return any datatype value from a function. We three types of user-defined functions.The user-defined scalar function also returns a single value as a result of actions performed by the function. Difference between CTE and Temp Table and Table VariableThis returns no of counts from a collection of values.These functions are created by the user in the system database or in a user-defined database.
Different Syntax In Sql Update CommandUnlike Stored
Unlike Stored Procedure, Function accepts only input parameters. This is not affected by above function update commandUnlike Stored Procedure, Function returns an only single value. -Create function for EmpID,FirstName and Salary of EmployeeInsert into Select e.EmpID,e.FirstName,e.Salary from Employee e -It will update only in table not in Original Employee tableEnd -Now call the above created functionSelect * from fnGetMulEmployee() -Now see the original table. In this, a table variable must be explicitly declared and defined whose value can be derived from multiple SQL statements.
User Defined Function can't return XML Data Type. User Defined Function can have upto 1023 input parameters while a Stored Procedure can have upto 2100 input parameters. Like Stored Procedure, Function can be nested up to 32 levels.
SummaryIn this article, I try to explain the types of function in SQL server with an example. User Defined Function doesn't support set options like set ROWCOUNT etc. User Defined Function can call only Extended Stored Procedure.
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