Creating a user defined function in oracle SQL called lastnamefirst

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I am using oracle SQL developper.

I am trying to create a function that will accept two parameters (first and last name) and return them as one variable, with the last name showing up first. Here is my function.

CREATE OR REPLACE FUNCTION LASTNAMEFIRST
(
varFirstName IN VARCHAR2,
varLastName IN VARCHAR2
)
RETURN VARCHAR2 AS 
BEGIN

DECLARE varFullName VARCHAR2;

DEFINE varFullName := CONCAT(varLastName,' ' ,varFirstName);

  RETURN varFullName;
END LASTNAMEFIRST; 

I am receiving an error on the semicolon at 'end lastnamefirst' "syntax error" I keep trying to change small things and that same error just shows up in different places whenever I change things. What am I doing wrong?

User-Defined Functions, Therefore, if your user-defined functions will be called from SQL statements, you must CREATE FUNCTION for information on creating functions, including  Use the CREATE FUNCTION statement to create a standalone stored function or a call specification. A stored function (also called a user function or user-defined function) is a set of PL/SQL statements you can call by name. Stored functions are very similar to procedures, except that a function returns a value to the environment in which it is

I would expect the Oracle syntax to look more like:

CREATE OR REPLACE FUNCTION LASTNAMEFIRST (
   in_FirstName IN VARCHAR2,
   in_LastName IN VARCHAR2
)
RETURN VARCHAR2 AS
    v_FullName varchar2(4000);
BEGIN
    v_FullName := in_LastName || ' ' || in_FirstName;

    RETURN v_FullName;
END;  --  LASTNAMEFIRST; 

This can of course be simplified (say by not using a local variable), but it follows the logic of your code.

create function, A stored function (also called a user function or user-defined function) is a set of PL/SQL statements you can call by name. Stored functions are very similar to  This topic describes how to create a user-defined function (UDF) in SQL Server by using Transact-SQL. Before You Begin Limitations and restrictions. User-defined functions cannot be used to perform actions that modify the database state. User-defined functions cannot contain an OUTPUT INTO clause that has a table as its target.

Using DECLARE where you have is essentially starting a new code block, which is leading to the error you see. In your code, the DECLAREisn't necessary if you move the variable declaration prior to the BEGIN. DEFINE is also invalid. Something like this should work:

CREATE OR REPLACE FUNCTION LASTNAMEFIRST
(
varFirstName IN VARCHAR2,
varLastName IN VARCHAR2
)
RETURN VARCHAR2 AS 
   varFullName VARCHAR2(100);
BEGIN
  varFullName := varLastName || ' ' || varFirstName;
  RETURN varFullName;
END LASTNAMEFIRST;

This could be simplified further by removing the variable declaration completely:

CREATE OR REPLACE FUNCTION LASTNAMEFIRST
(
varFirstName IN VARCHAR2,
varLastName IN VARCHAR2
)
RETURN VARCHAR2 AS 
BEGIN
  RETURN varLastName || ' ' || varFirstName;
END LASTNAMEFIRST;

B Create and test a user defined function named LastNameFirst that , B Create and test a user defined function named LastNameFirst that combines two C. Create and test a view called CustomerSaleSummaryView that contains the Chapter Ten B – Managing Databases with Oracle Database 11g Release 2 Write an SQL statement to show a unique SKU and SKUDescription for all  Oracle PL/SQL – CREATE FUNCTION statement is used to create user defined function. It’s also known as stored function or user function. User defined functions are similar to procedures. The only difference is that function always returns a value. User defined functions can be used as a part of an SQL expression.

A Create and test a user defined function named LastNameFirst that , A Create and test a user defined function named LastNameFirst that combines varFullName Varchar(60); -- SQL statements to concatenate the names in the proper B. Create and test a view called CustomerSaleSummaryView that contains the In Oracle Database we will have to write an AFTER UPDATE trigger on  User Defined Functions in SQL. by suresh. The User Defined Functions in SQL Server are like functions in any other programming language that accepts the parameters, performing complex calculations, and returning the result value.

[PDF] Transact-SQL User-Defined Functions, CREATE FUNCTION worked in Oracle's PL/SQL, so I assumed that it would work in T-SQL as well. To create a function, a user must have the statement permission called. CREATE form a last name first, first name last string. It's used as an  User defined functions are similar to procedures. The only difference is that function always returns a value. User defined functions can be used as a part of an SQL expression.

[PDF] Developing User-defined Routines (SQL and External), Inline SQL PL and SQL functions, triggers, and compound SQL Building user-​defined functions in C or C++ previously called SQL Administrative Routines. Built-in A result set is returned with the last name, first name, and new salary for​. A stored function (also called a user function or user-defined function) is a set of PL/SQL statements you can call by name. Stored functions are very similar to procedures, except that a function returns a value to the environment in which it is called. User functions can be used as part of a SQL expression.