TASK DEFINITION: In this task you are expected to provide an SQL statement from an english description of what that SQL statement does. The description may include multiple steps but you should only ouput one SQL statement that accomplishes every step. An SQL query works by selecting data from a table where certain conditions apply. A table contains columns where every row in that table must have a value for each column. Every table has a primary key that uniquely identifies each row, usually an id. To choose which columns are returned you specify that after the "SELECT" statement. Next, you use a "FROM" statement to specify what tables you want to select the data from. When you specify a table you can rename it with the "AS" statement. You can reference that table by whatever name follows the "AS" statement. If you want to select data from multiple tables you need to use the "JOIN" statement. This will join the tables together by pairing a row in one table with every row in the other table (Cartesian Product). To limit the number of rows returned you should use the "ON" statement. This will only return rows where the condition specified after the statement is true, this is usually an equals operator with primary keys. You can also use the "WHERE" statement to specify that only rows with column values statisfying a certain condition, should be returned. The "GROUP BY" statement will group rows together that have equal column values for whatever columns follows the statement. The "HAVING" statement will return groups that statisfy whatever condition follows the statement. Any column(s) being returned from grouped rows must either be an aggregate function, (AVG, MAX, COUNT, SUM, ...) of a column, or the column(s) that the data was grouped by. To sort the returned data you can use the "ORDER BY" command which will order the data by whatever aggregate function or column follows the statement. The "DESC" statement will sort in descending order and the "ASC" statement will sort in ascending order. Finally, you can use the "LIMIT" statement to return a certain number of rows. When "*" is used in an SQL statement every column is returned. For example, SELECT * FROM table WHERE attribute = 1, will select every column from rows with the attribute column equal to 1.
PROBLEM: Step 1: find the Fname, Sex of Student table.
Step 2: For each row in Has_Allergy table, find corresponding rows in Allergy_Type table and in Student table.
Step 3: find Fname, Sex of the results of step 2 whose Allergy_Type's Allergy equals Cat.
Step 4: show the rows that are in the results of step 1 but not in the results of step 3

SOLUTION: SELECT T1.Fname , T1.Sex FROM Student AS T1 EXCEPT SELECT T1.Fname , T1.Sex FROM Allergy_Type AS T2 JOIN Has_Allergy AS T3 ON T2.Allergy = T3.Allergy JOIN Student AS T1 ON T3.StuID = T1.StuID WHERE T2.Allergy = "Cat"

PROBLEM: Step 1: find the average total_value_purchased of each value of product_id in Product_Suppliers table.
Step 2: find supplier_id in Product_Suppliers table whose corresponding value in step 1 is greater than 50000

SOLUTION: SELECT supplier_id FROM Product_Suppliers GROUP BY product_id HAVING Avg ( total_value_purchased ) > 50000

PROBLEM: find the ClubName of Club table for which ClubName equals AKW

SOLUTION:
SELECT ClubName FROM Club WHERE ClubName = "AKW"