SQL Temporary Tables

Temporary tables in SQL are tables that exist temporarily on the database. These tables can be created at runtime and can do the all kinds of operations that a normal table can do. However, the temporary tables are deleted as soon as the user session that created the tables has ended.

Here is how you create a temporary table:

CREATE TEMPORARY TABLE TempTable (
    ID int,
    Name varchar(255)
);

This code creates a new temporary table named TempTable with two columns: an ID column and a Name column.

You can also create a temporary table using the SELECT INTO syntax:

SELECT column1, column2
INTO TempTable
FROM existingTable
WHERE condition;

This query creates a new temporary table named TempTable, using the result set from a SELECT statement from existingTable. The new table will include all the columns in the SELECT statement.

You can then use this temporary table within your session like you would a normal table. For example:

SELECT * FROM TempTable;

This will select all rows from TempTable.

It's important to remember that these tables are session-specific. As soon as your database connection or session is closed, the table will be automatically dropped by the database system. If you need a table that persists beyond your current session, you should create a regular (non-temporary) table.

Finally, SQL syntax can vary slightly between different SQL dialects (such as MySQL, PostgreSQL, SQLite, etc.). Always consult the relevant documentation for your specific SQL implementation.

Creating and Using Temporary Tables in SQL:
- Description: Temporary Tables are created and used within a session and are automatically dropped when the session ends.
- Code Example:
```
CREATE TEMPORARY TABLE temp_table (
    column1 INT,
    column2 VARCHAR(50)
);

INSERT INTO temp_table (column1, column2) VALUES (1, 'Value1');
SELECT * FROM temp_table;
```
Local vs Global Temporary Tables in SQL:
- Description: Local Temporary Tables are session-specific and are dropped when the session ends. Global Temporary Tables are visible to all sessions but are dropped when the creating session ends.
- Code Example (Local Temporary Table):
```
CREATE TEMPORARY TABLE #local_temp_table (
    column1 INT
);
```
  Code Example (Global Temporary Table):
```
CREATE TEMPORARY TABLE ##global_temp_table (
    column1 INT
);
```

Managing Temporary Tables in Stored Procedures:

Description: Temporary Tables can be created, used, and dropped within stored procedures, providing a way to manage and process data.

Code Example:

CREATE PROCEDURE process_data()
BEGIN
    CREATE TEMPORARY TABLE temp_table (
        column1 INT,
        column2 VARCHAR(50)
    );

    -- Perform operations on temp_table

    DROP TEMPORARY TABLE temp_table;
END;

Lifetime and Scope of Temporary Tables in SQL:
- Description: The lifetime of a Temporary Table is limited to the session or transaction in which it is created. The scope is within the session that created it.
- Code Example:
```
-- Session 1
CREATE TEMPORARY TABLE temp_table (
    column1 INT
);

-- Session 2
SELECT * FROM temp_table; -- Error: temp_table not found
```
Inserting Data into Temporary Tables in SQL:
- Description: Data can be inserted into Temporary Tables using the standard INSERT INTO statement.
- Code Example:
```
CREATE TEMPORARY TABLE temp_table (
    column1 INT,
    column2 VARCHAR(50)
);

INSERT INTO temp_table (column1, column2) VALUES (1, 'Value1');
```
Dropping Temporary Tables in SQL:
- Description: Temporary Tables are automatically dropped when the session or transaction ends. You can also explicitly drop them using the DROP TEMPORARY TABLE statement.
- Code Example:
```
CREATE TEMPORARY TABLE temp_table (
    column1 INT,
    column2 VARCHAR(50)
);

-- Explicitly drop the Temporary Table
DROP TEMPORARY TABLE temp_table;
```