SELECT impressions.*
FROM impressions
WHERE impressions.user_id = 2
AND impressions.action_name = 'show'
AND (impressions.message IS NOT NULL)
GROUP BY impressionable_id, impressionable_t
对于以下查询，我只需要选择具有最低shape_type值（范围从1到10）的第一条记录。如果你有任何关于如何轻松做到这一点的知识是postgresql，请帮忙。谢谢你的时间。 select g.geo_id, gs.shape_type
from schema.geo g
join schema.geo_shape gs on (g.geo_id=gs.geo_id)
order by gs
嗨，大家好即时如果我改变限制10个或20的结果是不同的 我学习的PostgreSQL我无法弄清楚是什么问题 是否有postgresql特定的警告？ WITH RECURSIVE children AS (
SELECT id, name, 1 AS depth
FROM wapi_categories
WHERE parentid = 1 AND visible
我是新来的SQL和我使用postgres 9.6，我有2个查询，我想加入他们到1。我想通过这个字段上按我在这里 1查询 select count(s.city)::text as most_topics,
city::text || ', ' || state::text AS location from streams s
group by (location) order by most_
我尝试用“独特的”教义，但我得到了以下错误： Error: Expected known function, got 'on' class Report extends EntityRepository
{
public function findForList() {
$queryBuilder = $this->createQueryBuilder('r');