Can you have unique constraints on jsonb columns keys? I've looked for examples but haven't found any what is the proper syntax? Here's what I tried:
CREATE TABLE report_json (
recnum int,
id integer,
report jsonb,
PRIMARY KEY (recnum),
CONSTRAINT report_json_unique_constraint UNIQUE (id,((report ->> 'data')::int),((report ->> 'ctc')::int),((report ->> 'dtg')::int)
);
which causes a syntax error at the first '(' around 'report ->>'.
