Sequence

Returns a cursor over the concatenated results of mapping transform over self.

Returns an expression by joining all elements with an associative SQL binary operator.

For example:

// SELECT * FROM player
// WHERE (registered
//        AND (score >= 1000)
//        AND (name IS NOT NULL))
let conditions = [
    Column("registered"),
    Column("score") >= 1000,
    Column("name") != nil]
Player.filter(conditions.joined(operator: .and))

When the sequence is empty, joined(operator:) returns the neutral value of the operator. It is 0 (zero) for .add, 1 for ‘.multiply, false for.or, and true for.and`.

An SQL expression that checks the inclusion of an expression in a sequence.

// id IN (1,2,3)
[1, 2, 3].contains(Column("id"))