Hi,

Is it possible to invoke functions such as LEAST or GREATEST from within a 
UNIQUE constraint? I am having problems trying to implement 
http://stackoverflow.com/a/16867094/14731

I invoked:
CREATE TABLE connections (id IDENTITY, from_participant_id BIGINT NOT NULL, 
to_participant_id BIGINT NOT NULL, UNIQUE (LEAST(from_participant_id, 
to_participant_id), GREATEST(from_participant_id, to_participant_id)));

and got this error:

org.h2.jdbc.JdbcSQLException: Syntax error in SQL statement "CREATE TABLE 
CONNECTIONS (ID IDENTITY, 
FROM_PARTICIPANT_ID BIGINT NOT NULL, TO_PARTICIPANT_ID BIGINT NOT NULL,
UNIQUE (LEAST([*]FROM_PARTICIPANT_ID, TO_PARTICIPANT_ID), 
GREATEST(FROM_PARTICIPANT_ID, TO_PARTICIPANT_ID))) "; expected "ASC, DESC, 
NULLS, ,, )"; SQL statement: trimmed [42001-172]

What am I doing wrong? How would you implement the desired behavior under 
H2?

Thanks,
Gili

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