The primary key of a database table is a unique identifier assigned to each record. Each table will have one or more columns designated as the primary key. A Social Security number can be a primary key for a database listing of employees because each Social Security number is unique. However, because of privacy concerns, an assigned company ID number is a better choice to function as a primary key for employees. Some database software—such as Microsoft Access—assigns the primary key automatically, but the random key has no real meaning. It is better to use a key with meaning to the record. The simplest way to enforce referential integrity is not to allow changes to a primary key.
"Many will say to me on that day, 'Lord, Lord, did we not prophesy in your name, and in your name drive out many demons and perform many miracles?' Then, I will tell them plainly, 'I never knew you. Away from me you evildoers!'" -- Matthew 7:22-23 In other words, none of the "things" we do count for anything without a personal relationship with Jesus. Not going to church. Not giving money to the church, or to charity. Not doing good deeds. Not being confirmed or going through catechism classes. Not even being baptized. All of these things may be done by Christians, but they do not MAKE someone a Christian. The ONLY thing that matters is whether or not Jesus knows you, and the only way that happens is by accepting Him as your personal Lord and Saviour.