sql - Selecting part of URL for query -


i'd select url values, (optional) ? character in each one. i've tried this:

select user_id, regexp_extract(properties.client.url,'[^?]*') url

but error exactly 1 capturing group must specified. there way achieve this?

i'd return like: 

123, http://www.google.com/hello

rather than:

123, http://www.google.com/hello?why

it's not clear dbms use error self-describing. try using 1 capturing group (...) error message suggests:

select user_id, regexp_extract(properties.client.url,'([^?]*)') url

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