Final answer:
The number of rows returned from joining a table of 9 rows with a table of 100 rows depends on the type of SQL join used and the relationships between the tables.
Step-by-step explanation:
Without additional context, such as the type of SQL join being used, it is not possible to determine exactly how many rows would be returned in the result set when joining a table with 9 rows (employee table) with another table that has 100 rows (customer table). For example, using a full outer join would return all rows from both tables, whereas an inner join would only return the rows that have matching values in both tables. If every employee had at least one customer related record in the customer table, and you were performing an inner join, you'd expect potentially up to 900 returned rows if each employee related to each customer once—this assumes a complete Cartesian product between employees and customers. However, the actual number returned could be much less depending on the relationship between the two tables.