$1.$ Three of the supporting tables, "log$\_$areas", "log$\_$pages", and "log$\_$referers", use auto$-$increment IDs for primary keys. These keys have already been created. The fourth table, "log$\_$clients" is going to use some different logic for its ID field, and it will not be an auto$-$increment identity column. It still needs to be a primary key, so use an ALTER TABLE statement to make the $"$ID$"$ column the primary key$\mathrm{.}1.$ Three of the supporting tables, "log$\_$areas", "log$\_$pages", and "log$\_$referers", use auto$-$increment IDs for primary keys. These keys have already been created. The fourth table, "log$\_$clients" is going to use some different logic for its ID field, and it will not be an auto$-$increment identity column. It still needs to be a primary key, so use an ALTER TABLE statement to make the $"$ID$"$ column the primary key.