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
對於以下查詢，我只需要選擇具有最低shape_type值（範圍從1到10）的第一條記錄。如果你有任何關於如何輕鬆做到這一點的知識是postgresql，請幫忙。謝謝你的時間。 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，大家好即時如果我改變限制10個或20的結果是不同的 我學習的PostgreSQL我無法弄清楚是什麼問題 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
我是新來的SQL和我使用postgres 9.6，我有2個查詢，我想加入他們到1。我想通過這個字段上按我在這裏 1查詢 select count(s.city)::text as most_topics,
city::text || ', ' || state::text AS location from streams s
group by (location) order by most_
我嘗試用「獨特的」教義，但我得到了以下錯誤： Error: Expected known function, got 'on' class Report extends EntityRepository
{
public function findForList() {
$queryBuilder = $this->createQueryBuilder('r');