How to use Temporary Variables to Declare Variable in SQL In SQL
Temporary tables can be used to store and manipulate data within a session. We can take advantage of temporary tables to mimic variable declaration.
Query:
CREATE TEMP TABLE Temp_Table (num INTEGER,name STRING);
INSERT INTO Temp_Table VALUES (23,"GFG");
SELECT num,name FROM Temp_Table;
Output:
Explanation: The output displays a temporary table named “Temp_Table” created with two columns: “num” of type INTEGER and “name” of type STRING. One row is inserted with values (23, “GFG”). The subsequent SELECT statement retrieves and displays the values from the “num” and “name” columns of “Temp_Table“.
How to Declare a Variable in SQL?
Variables in SQL are a fundamental step towards building efficient and powerful database applications. It enhances the flexibility and efficiency of our database queries.
Understanding how to declare variables in SQL is very important for writing scalable code. Variables act as placeholders for data, which enable us to manipulate and store information within our SQL programs.
Here, we’ll explore the various methods and best practices for declaring variables in SQL, along with the syntax and examples, that help us write more dynamic and effective queries.