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Postgresql 查询其中所有关联记录的属性值均为X

postgresql

Postgresql 查询其中所有关联记录的属性值均为X,postgresql,relational-division,Postgresql,Relational Division,我有一个计算关联记录和关联状态的查询 SELECT orders.id, SUM(CASE WHEN s.shipment_status='CLOSED' THEN 1 ELSE 0 END) as closed, COUNT(*) as shipment_count FROM orders as po JOIN shipments as s ON s.order_id = po.id GROUP BY po.id 我正在尝试查询所有订单，其中所有装运已关闭 从本质上看，当关闭=

我有一个计算关联记录和关联状态的查询

SELECT
  orders.id,
  SUM(CASE WHEN s.shipment_status='CLOSED' THEN 1 ELSE 0 END) as closed,
  COUNT(*) as shipment_count
FROM orders as po
JOIN shipments as s ON s.order_id = po.id 
GROUP BY po.id
我正在尝试查询所有订单，其中所有装运已
关闭

从本质上看，当
关闭=装运计数时返回


如果我在join中添加一个
和
子句，那么它只会限制装运的数量。
我通过一个
HAVING
子句解决了这个问题，该子句不使用select ATTR


SELECT
  orders.id
FROM orders as po
JOIN shipments as s ON s.order_id = po.id
GROUP BY po.id
HAVING SUM(CASE WHEN s.shipment_status='CLOSED' THEN 1 ELSE 0 END) = COUNT(*)


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