To remove double quotes from date string in SQL - google-bigquery

Question

I am using JSON_EXTRACT() to retrieve the date from json.
I want to get the date without double quotes.
Here is the example of what I am doing :
JSON_EXTRACT(JSON_EXTRACT(events, "$.my_member"), "$.my_Number") as xyz
my_number holds date string as "2016-01-01 11:31:25", I want this without the double quotes.
I tried using timestamp as :
timestamp(JSON_EXTRACT(JSON_EXTRACT(events, "$.my_member"), "$.my_Number"))
but it is returning a null value to xyz.
Thanks.

Answer 1

Try
JSON_EXTRACT_SCALAR(JSON_EXTRACT(events, "$.my_member"), "$.my_Number")
Also, you should be able to further "optimize" your expression by building proper JSON Path and using JSON function only ones. See "hint" below
SELECT
JSON_EXTRACT_SCALAR(
'{"my_member":{"my_Number":"2016-01-01 11:31:25"}}',
"$.my_member.my_Number"
)
See more details and also difference between JSON_EXTRACT_SCALAR and JSON_EXTRACT at JSON functions

Answer 2

Run REPLACE
REPLACE(JSON_EXTRACT(JSON_EXTRACT(events, "$.my_member"), "$.my_Number"),"\"","") as xyz

Answer 3

I tried JSON_EXTRACT_SCALAR in MySQL Workbench but I got Error Code: 1305. FUNCTION manifest.JSON_EXTRACT_SCALAR does not exist
Instead I used JSON_UNQUOTE and that did the trick.
I have a column called 'buffer_time' which contains:
'{"after": {"time": "00:01:00", "is_enabled": true}, "before": {"time": "00:04:00", "is_enabled": true}}'
JSON_UNQUOTE(JSON_EXTRACT(buffer_time, '$.after.time'))
gave me: `
00:01:00
Hope that helps.