Обсуждение: JSONB matching element count

Hi,

This says if matched found or not against the input array :

'{"a":1, "b":2, "c":3}'::jsonb ?| array['b', 'c']

But how would I determine how many matched ? Like for the above example, I see only 2 matched found.

--
================
Regards,
Arup Rakshit
================
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as
possible,you are, by definition, not smart enough to debug it. 

--Brian Kernighan

On Sun, May 31, 2015 at 11:07 PM, Arup Rakshit
<aruprakshit@rocketmail.com> wrote:
> Hi,
>
> This says if matched found or not against the input array :
>
> '{"a":1, "b":2, "c":3}'::jsonb ?| array['b', 'c']
>
> But how would I determine how many matched ? Like for the above example, I see only 2 matched found.

You could use "?" to do the check for each individual key, and then
count how many matched...
--
Michael