Implicitwhere

Implicitwhere is a term used in certain programming contexts, particularly in database query languages and functional programming, to describe a conditional filter that is not explicitly stated but is implied by the structure of the expression or the context in which it is used. It represents a way to narrow down the scope of an operation without a visible `WHERE` clause.

In SQL, while not a standard keyword, the concept can arise. For instance, if a query joins two tables on a specific column, the join condition implicitly acts as a filter. If a subquery is used, the results of the subquery implicitly filter the outer query's data. The "implicitwhere" is the unstated condition that restricts the data being considered.

In functional programming, especially with list comprehensions or similar constructs, the syntax itself can embed implicit filtering. For example, in Python, a list comprehension like `[x2 for x in numbers if x > 10]` explicitly uses an `if` clause. However, a more complex chain of operations or a function that returns a filtered sequence could be seen as having an implicitwhere. The intent is to achieve selective processing of data based on conditions that are not formally declared with a specific keyword like `WHERE`. The focus is on the result rather than the explicit declaration of the filtering mechanism.