SQL functions are built into Oracle Database and are available for use in various appropriate SQL statements. Do not confuse SQL functions with user-defined functions written in PL/SQL. If you call a SQL function with an argument of a datatype other than the datatype expected by the SQL function, then Oracle attempts to convert the argument to the expected datatype before performing the SQL function. If you call a SQL function with a null argument, then the SQL function automatically returns null.
Marching. Marching refers to the organized, uniformed, steady and rhythmic walking forward, usually associated with military troops. Marching is often performed to march music, and often associated with military parades. Marching is part of basic training in the military in most countries. In most cases, marching uses a system of drill commands. Learning to march by obeying commands is considered a form of discipline.
A line of cars moving together to a cemetery is a funeral procession, and a bunch of parents pushing babies in strollers in a parade are also a procession. Another meaning of procession is any line or succession of people moving continuously, like a procession of local politicians knocking on your door one afternoon.