How to extract a value from JSON in Presto?

Question

{"xyz":{"aaabc":"80.00","ccccd":null,"npccc":"0.00","txnid":"pca","diccsc":"0.00"}}

I have to extract xyz where xyz is dynamic variable ( in some case it maybe xyz in other it may be abc or anything )

Answer 1

Assuming your data is a varchar , you can

• convert to json
• cast to map(varchar, json)
• extract entries from a map with map_entries
• get the first one

SELECT map_entries(CAST(CAST(my_column AS json) AS map(varchar, json))[1]
FROM ...