Creating a Stored Procedure with Temporary Tables

Create a Stored Procedure with Temporary Tables

Write a SQL query to create a stored procedure that uses temporary tables to process intermediate results.

Solution:

-- Create a stored procedure with temporary tables.
CREATE PROCEDURE ProcessEmployeeData
AS
BEGIN
    -- Create a temporary table to store intermediate results.
    CREATE TABLE #TempEmployees (
        EmployeeID INT,
        Name NVARCHAR(100),
        Salary DECIMAL(10, 2)
    );

    -- Insert data into the temporary table.
    INSERT INTO #TempEmployees (EmployeeID, Name, Salary)
    SELECT EmployeeID, Name, Salary
    FROM Employees
    WHERE Salary > 50000;

    -- Perform additional processing on the temporary table.
    SELECT * 
    FROM #TempEmployees
    ORDER BY Salary DESC;

    -- Drop the temporary table explicitly (optional, as it is dropped automatically).
    DROP TABLE #TempEmployees;
END;

Explanation:

1. Purpose of the Query :

1. The goal is to create a stored procedure that uses a temporary table to filter and process intermediate results before returning the final output.

2. Key Components :

1. CREATE TABLE #TempEmployees : Creates a temporary table to store intermediate results.
2. INSERT INTO : Populates the temporary table with filtered data.
3. DROP TABLE : Explicitly drops the temporary table (optional).

3. Why Use Temporary Tables? :

1. Temporary tables allow you to break down complex queries into manageable steps and improve readability.

4. Real-World Application :

1. For example, in reporting systems, you might use this procedure to filter high-salary employees and perform further analysis.

Additional Notes:

• Temporary tables are session-specific and are automatically dropped when the session ends.
• Use this exercise to teach how to modularize complex queries using temporary tables.

For more Practice: Solve these Related Problems:

• Write a SQL query to create a stored procedure that uses temporary tables to process intermediate results for generating a complex report.
• Write a SQL query to create a stored procedure that employs temporary tables to perform multi-step calculations on financial data.
• Write a SQL query to create a stored procedure that utilizes temporary tables to store and manipulate session-specific user preferences.
• Write a SQL query to create a stored procedure that leverages temporary tables to break down a large dataset into smaller, manageable chunks for analysis.

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Previous SQL Exercise: Creating a Scalar Function with Aggregation.