What is DECLARE in database?

What is DECLARE in SQL?

The DECLARE statement is used to declare a variable in SQL Server. In the second step, we have to specify the name of the variable. Local variable names have to start with an at (@) sign because this rule is a syntax necessity. Finally, we defined the data type of the variable.

What is DECLARE in DBMS?

DBMS DECLARE CONNECTION opens a session on a database engine. If the statement executes successfully, it allocates a connection structure and adds it to the list of open structures. Applications which must connect to two or more database servers should declare a named connection to each server.

What is DECLARE and set in SQL?

Variables in SQL procedures are defined by using the DECLARE statement. Values can be assigned to variables using the SET statement or the SELECT INTO statement or as a default value when the variable is declared. Literals, expressions, the result of a query, and special register values can be assigned to variables.

What is DECLARE in Oracle SQL?

You can declare constants and variables in the declarative part of any PL/SQL block, subprogram, or package. Declarations allocate storage for a value, specify its datatype, and specify a name that you can reference. Declarations can also assign an initial value and impose the NOT NULL constraint.