No null. Mog uses ?T (Optional) for values that might be absent — ?int, ?string (see Chapter 10). The type system distinguishes between “definitely has a value” and “might not have a value.” You cannot accidentally dereference something that does not exist.
反家庭暴力法是2016年3月1日正式实施的，今年正好十周年。过去十年，这部法律发挥了积极作用，取得了良好的社会效果。最重要的是，它推动全社会逐步形成共识——家暴不是家务事，面对家暴要勇敢说“不”。
。wps对此有专业解读
Postgres' Top K approach is a bit like all or nothing — the happy path is nearly instant, but the worst case can take seconds or even minutes.
Rhia said she enjoyed her first concert at the arena, Tate McRae last year, despite her initial concerns about the arena