Why is this better as a function? First of all, it makes intuitive sense to me. The subprogram takes inputs and returns a single result, and that’s what a function is for. Also, as stated earlier, functions can be used within standard SQL, so we can do this: ...
I’ve always appreciated the CREATE OR REPLACE functionality in Oracle for views, packages and triggers, and I’ve often wanted a similar CREATE OR REPLACE TABLE. Many times, I’ll find myself needing to quickly drop and re-create a table while I’m designing it. This is tedious, becaus...
"Settings" in DLL project properties and app.config file "The function evaluation requires all threads to run" while accessing music library through wmp.dll "The left-hand side of an assignment must be a variable, property or indexer". Help? "The remote server returned an error: (401) Un...
It is quite simple to create user define Aggregate function in Oracle.For creating a user define aggreagte function, we need - Object type specification Object type body PL/SQL aggregate function So armed with all these information, we can now create our own aggregate function that will perform...
Now it's time to create functions, Create a function GetAllEmployee() that will return all the employees, see listing 10. CREATE OR REPLACE FUNCTION GetAllEmployees() RETURNS Employees LANGUAGE SQL AS $$ SELECT * FROM Employees; $$; Listing 10. Figure11. The 'Select' statement...
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Indexes. They're one of the most powerful and misunderstood aspects of SQL performance. In this post we'll look at the purpose of an index, how to create and choose choose your index type. Then finish with a discussion of how to decide what to index and
A view can be created even if the defining query of the view cannot be executed, as long as the CREATE VIEW command has no syntax errors. We call such a view a view with errors. For example, if a view refers to a non-existent table or an invalid column of an existing table, or ...
We have a database tools (abbreviated as DBT) application that stores all the information of our MySQL, PostgreSQL, Microsoft SQL Server and Oracle RDBMS databases in one location. This DBT-application links a given database to an application, the database to an instance and the ...
How to Create the MySQL REST API DreamFactory can generate REST APIs for a multitude of databases, among themMySQL, Microsoft SQL Server, Oracle,PostgreSQL, and MongoDB. 1. Using DreamFactory To do so, you'll login to the DreamFactory administration interface, navigate toServicesand then enter ...