Ok - there was a column misordering in my rather complicated procedure.
The form which works to handle possibly null-valued (timestamp) values is indeed:
u:='INSERT INTO ' || mytable || ' VALUES(' ||
COALESCE(quote_literal(mytime),'NULL') || ')';
Thanks for your help. I hope to be good at this plpgsql at some point!
Celia
> Hmm, my simple tests worked, can you show the full function
> definition and the table definition of the table you're trying to
> insert into?
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