原则SQL查询顺序（按ASC NULL）最后

Question

我使用的是 Doctrine 2.4 。然后，我尝试按优先级升序对我的广告系列列表进行排序，优先级为NULL，优先级最后为0。

SELECT "e"."First_name"
FROM public."Employee" as e
JOIN public."Manager_data" as m
ON "m"."ID" = "e"."Manager_id"
WHERE "Manager_id" = 4

您知道我该怎么做吗？

SELECT * FROM campaign ORDER BY priority IS NULL, priority = 0, priority ASC

Answer 1

order by case when priority is null then 1 else 0 end, priority

Answer 2

我找到了解决方案，我做到了：

$query->addSelect('CASE WHEN c.priority IS NULL THEN 1 ELSE 0 END as HIDDEN priority_is_null');
$query->addSelect('CASE WHEN c.priority = 0 THEN 1 ELSE 0 END as HIDDEN priority_is_zero');
$query->addOrderBy('priority_is_null', 'ASC');
$query->addOrderBy('priority_is_zero', 'ASC');
$query->addOrderBy('c.priority', 'ASC');