RedShift：关系不存在

Question

我在 RedShift 的“输入”列中有下一个数据：

[{"desc": "How many people does the video contain?", "name": "Number of People", "type": "dropdown", "values": ["", "Only 1", "2-3", "3+"]}, {"desc": "What is the camera position?", "name": "Movement", "type": "dropdown", "values": ["", "Fixed position", "Moving"]}, {"desc": "From which angle did you shoot the video?", "name": "Shoot Angle", "type": "dropdown", "values": ["", "Frontal recording", "Tight angle: 10-40 degree", "Wide angle: 40-70 degree"]}, {"desc": "From which distance did you shoot the video?", "name": "Distance", "type": "dropdown", "values": ["", "Near/Selfie", "Mid (3-6 ft)", "Far (>6 ft)"]}, {"desc": "What is the video lighting direction?", "name": "Lighting Direction", "type": "dropdown", "values": ["", "Front lit", "Side lit", "Back lit"]}, {"desc": "What is the video background?", "name": "Background", "type": "dropdown", "values": ["", "Outdoors", "In office", "At home", "Plain background"]}, {"desc": "What is the topic in your speech?", "name": "Topic", "type": "dropdown", "values": ["", "Arts and Media", "Business", "Education", "Entertainment", "Food/Eating", "Nutrition", "Healthcare ", "High School Life", "Mental Health", "News", "Technology", "Morals and Ethics", "Phones and Apps", "Sports", "Science"]}

“输入”不是“超级”类型的列。

所以，我需要将每个 dict 解析到每一行。

我尝试使用这个查询：

SELECT JSON_PARSE(c.inputs)::super AS jp, d.desc FROM appen_collect.staticprompts AS c, jp AS d WHERE prompttype = 'input' LIMIT 10;

但我得到一个错误：关系“jp”不存在。

不知道为什么……

Answer 1

可能需要格式化为子查询，试试下面：

select d.desc
from
(
    select json_parse(inputs)::super as jp
    from appen_collect.staticprompts
    where prompttype = 'input'
) as c, jp as d
limit 10;