I have a table with a JSON column points
with one of the rows as:
{"0": 0.2, "1": 1.2, "2": 0.5, "15": 1.2, "20": 0.7}
I want to get the values for keys "1"
and "20"
and store them as an alias like first
and second
in a query. What I've done till now is:
SELECT points, k, v from rewards CROSS JOIN UNNEST(SPLIT_TO_MAP(points, ',', ':')) AS m(k,v) where name='John'
But this query gives me all the rows of k, v. How do I select only those two values corresponding to "1" and "20"?
JSON_EXTRACT_SCALAR达到了目的。
JSON_EXTRACT_SCALAR(points, '$["1"]') AS first_value
JSON_EXTRACT_SCALAR(points, '$["20"]') AS second_value
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