Minimum

min x     min[x]

Where x is a non-symbol sortable list, returns its minimum. The minimum of an atom is itself.

Nulls are ignored, except that if the argument has only nulls, the result is infinity.

q)min 2 5 7 1 3
1
q)min "genie"
"e"
q)min 0N 5 0N 1 3                  / nulls are ignored
1
q)min 0N 0N                        / infinity if all null
0W
q)select min price by sym from t   / use in a select statement

min is an aggregate function, equivalent to &/.