The SQL statements comprising the DDL for the COMPANY Database are given to you. For that database, answer the following queries. Create the files Q1 to Q10 in PostgreSQL. Do follow the restrictions stated for individual queries. When a query asks for "name" of employees, retrieve both, the first and the last names.

3. List the social security number of each employee that works on at least one of the projects 1, 2, and 3. You are allowed to use only one condition term in any WHERE clause.