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Applies to: 
Databricks SQL Databricks Runtime
Returns the least value of all parameters, skipping null values.
Syntax
least(expr1, expr2 [, ...] )
Arguments
exprN: An expression of any type that shares a least common type with all other arguments.
Returns
The result is the least common type of all arguments.
Examples
> SELECT least(10, 9, 2, 4, 3);
2