Nowadays JavaScript has three different keywords to declare a variable — var, let and, const. Each has its own properties and particularities. Let’s start by making a simple comparison table ...

Transact-SQL reference for using DECLARE to define local variables for use in a batch or procedure. Variables are declared in the body of a batch or procedure with the DECLARE statement and are ...

Sql server provides a number of global variables, which are very useful.the values of these variables is maintained by the server. all the global variables represent information specific to the server ...