SQL2 | How to add condition on multi-value field?

Hello,

I am trying to perform a JCR query using SQL2 in CQ5.6. For one of the conditions, I wish to compare a multi-value field (E.g. cq:tags).

How would that be possible? Currenlt, I only managed to compare my query item's cq:tags to a single value (e.g. WHERE page.[cq:tags]='mynspace:mytag').

Also, is there a syntax reference for SQL2 queries? Currently I have only managed to find something tanglible here : http://svn.apache.org/viewvc/jackrabbit/trunk/jackrabbit-spi-commons/src/test/resources/or g/apache/jackrabbit/spi/commons/query/sql2/test.sql2.txt?view=markup

Best regards, thanks in advance,

K.