我有json类型字段,如下所示
数据
{"age": 44, "name": "Jun"}
{"age": 19, "name": "Pablo", "attempts": [11, 33, 20]}
{"age": 33, "name": "Maria", "attempts": [77, 10]}
这里有些json数据有“尝试”数组,有些没有。当json有这个数组时,我需要得到不同字段中数组元素的和,需要如下结果
数据,数组的和
{"age": 44, "name": "Jun"} , (nothing here)
{"age": 19, "name": "Pablo", "attempts": [11, 33, 20]} , 64
{"age": 33, "name": "Maria", "attempts": [77, 10]} , 87
最佳答案
SELECT attempts.id,
sum(vals.v::integer) sum_attempts
FROM attempts
LEFT JOIN LATERAL jsonb_array_elements_text(val->'attempts') vals(v)
ON TRUE
GROUP BY attempts.id;
如果您使用的是
json_array_elements_text
而不是json
,请使用jsonb
。关于json - json数组的总和,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/43277178/