Extracting nested JSON keys
The field team would now like you to extract the current temperature and the temperature at 4AM. They said the hour_temperature key contains an array that starts at 12AM or midnight. The JSON is in the CTE for you again.
Cet exercice fait partie du cours
Introduction to Redshift
Instructions
- Extract the current temperature AS
current_tempfrom the weather station data. - Extract the
'hourly_temperature'at 4AM asfour_am_tempfrom the weather station data.
Exercice interactif pratique
Essayez cet exercice en complétant cet exemple de code.
-- weather_station CTE with the JSON in the data column
WITH weather_station AS (
SELECT '
{
"location": "Salmon Challis National Forest",
"date": "2024-02-10",
"weather": "Rainy",
"temperature": {
"current": 10,
"min": 8,
"max": 12,
"hourly_temperature": [8, 8, 9, 9, 10, 10, 11, 11, 12]
}
}'::SUPER::VARCHAR as data
-- Above line casts to SUPER and then to
-- VARCHAR to ensure it's ready for parsing
)
-- Extract the current temperature
SELECT ___(data, ___, ___) AS current_temp,
-- Extract the hourly_temperature at 4AM
___(data, ___,___, ___) as four_am_temp
-- Use the CTE
FROM ___;