[Dbix-class] how to find rows that have 0 many-to-many rel's

[Daniel McBrearty]

Hi

If I have two tables, say A and B,  that have a many-to-many
relationship, implemented in the usual way with a join table A_B - how
can I economically find rows in table A whose id's are not in A_B at
all (i.e. they have zero instances of B associated)?

Thanks

Daniel

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