Final answer:
To generate a new table listing all students and their class descriptions, one must use SQL commands involving INNER JOIN, UNION, and MINUS, with provisions to handle students not enrolled in any class and to substitute missing class descriptions with 'no description'.
Step-by-step explanation:
To create a new table containing the list of all students along with their class descriptions, which also includes students not enrolled in any classes, you would need to make use of SQL queries that involve INNER JOIN, UNION, and MINUS operations. An INNER JOIN can combine rows from two or more tables based on a related column between them. To address missing class descriptions, you can use SQL's COALESCE function or a CASE statement to replace null values with 'no description'. The UNION is used to combine the results of two SELECT statements, including all students even if they are not enrolled in any class. And, finally, the MINUS operation can help you find students who are not enrolled in any classes by subtracting the list of enrolled students from the complete list of students.
Assemble these SQL commands appropriately to generate the desired table, taking into account the various conditions mentioned in the question.To create a new table that contains the list of all students and class descriptions, along with the list of students not enrolled in any classes, you can use a combination of inner join, union, and minus operations.First, you can use an inner join to combine the student and class tables based on a common attribute, such as student ID. This will give you a table with all the students and their corresponding class descriptions.Next, you can use a union operation to include the list of all students who are not enrolled in any classes. This can be achieved by selecting the students who do not have a corresponding entry in the class table.