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trigger - dynamic WHERE clause

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EXECUTE 'SELECT 1 FROM ' || TG_TABLE_NAME || ' WHERE ' || whereclause
|| ' FOR UPDATE;';

I am generating the whereclause dynamically as the number of columns
queried varies. 

Am I right in assuming that I cannot use EXECUTE ... USING in this
scenario?

-- 

Best Regards,
Tarlika Elisabeth Schmitz

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