我的查询如下
SELECT w.payload,Count('payload') OVER () AS ROWCOUNT
FROM wholesale_confirmation.wholesale_order_confirmation w
WHERE w.delivery_date = COALESCE(NULL,w.delivery_date)
AND w.ship_to_location_id = COALESCE(NULL,w.ship_to_location_id)
AND w.order_raised_date = COALESCE(NULL,w.order_raised_date)
AND w.ship_from_location_id = COALESCE(NULL,w.ship_from_location_id)
LIMIT 10
OFFSET 0;
这给我的结果是这样的：
我想要{“payload：”[payload1,payload2,payload3],“rowcount”：n}.
Postgres版本10.3,有效载荷数据类型是jsonb
解决方法
COALESCE(NULL,w.delivery_date)归结为w.delivery_date.
因此WHERE w.delivery_date = COALESCE(NULL,w.delivery_date)归结为WHERE w.delivery_date IS NOT NULL.
Count(‘payload’)OVER()AS ROWCOUNT只是一种嘈杂的方式,表示count(*)OVER()AS rowcount并返回结果的总行数.
您当前的查询,简化：
SELECT payload,count(*) OVER () AS rowcount FROM wholesale_confirmation.wholesale_order_confirmation WHERE delivery_date IS NOT NULL AND ship_to_location_id IS NOT NULL AND order_raised_date IS NOT NULL AND ship_from_location_id IS NOT NULL LIMIT 10;
要获取更新后的问题中的JSON对象,包含一个JSON对象数组和总行数：
SELECT json_build_object('payload',jsonb_agg(payload),'rowcount',min(rowcount))
FROM (
SELECT payload,count(*) OVER () AS rowcount
FROM wholesale_confirmation.wholesale_order_confirmation
WHERE delivery_date IS NOT NULL
AND ship_to_location_id IS NOT NULL
AND order_raised_date IS NOT NULL
AND ship_from_location_id IS NOT NULL
LIMIT 10
) sub;
> Best way to get result count before LIMIT was applied
