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11 lines
392 B
SQL
11 lines
392 B
SQL
CREATE TRIGGER remove_conversions AFTER DELETE ON quantity_units
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BEGIN
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DELETE FROM quantity_unit_conversions
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WHERE from_qu_id = OLD.id
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OR to_qu_id = OLD.id;
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END;
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DELETE FROM quantity_unit_conversions
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WHERE NOT EXISTS(SELECT 1 FROM quantity_units WHERE id = quantity_unit_conversions.from_qu_id)
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OR NOT EXISTS(SELECT 1 FROM quantity_units WHERE id = quantity_unit_conversions.to_qu_id);
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