When a person needs to lock the table, they check to see if there is information in those 2 fields. If they are blank (NULL), then the record is locked and the 2 fields are populated with the ...

Run a query on a data table within your database, where "Example" is any table in your database from which you want to test query speed. This example selects every item from the "Example" table ...

Dynamic PHP pages give you the option to choose a MySQL table dynamically from which to query. You must ensure that the table exists before running a query on the table.