You can easily check your pulse on the inside of your wrist, below your thumb. 1  Gently place 2 fingers of your other hand on this artery. 2  Do not use your thumb, because it has its own pulse that you may feel.  Count the beats for 30 seconds, and then double the result to get the number of beats per minute.
It's not, LMB is Left Mouse Button. Its function can usually be replicated by the enter key.
A surrogate key is any column or set of columns that can be declared as the primary key instead of a real or natural key. Sometimes there can be several natural keys that could be declared as the primary key, and these are all called candidate keys.So a surrogate is a candidate key.