To delete rows from the SALES table, where the PROMO_NAME column in thePROMOTIONS table has either 'blowout sale' or 'everyday low price' as values. Which DELETE statements are valid? (Choose all that apply.)Select one or more:a.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')AND promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');b.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale'OR promo_name = 'everyday low price');c.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')OR promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');d.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name IN ('blowout sale','everyday low price'));
Question
To delete rows from the SALES table, where the PROMO_NAME column in thePROMOTIONS table has either 'blowout sale' or 'everyday low price' as values. Which DELETE statements are valid? (Choose all that apply.)Select one or more:a.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')AND promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');b.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale'OR promo_name = 'everyday low price');c.DELETEFROM salesWHERE promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'blowout sale')OR promo_id = (SELECT promo_idFROM promotionsWHERE promo_name = 'everyday low price');d.DELETEFROM salesWHERE promo_id IN (SELECT promo_idFROM promotionsWHERE promo_name IN ('blowout sale','everyday low price'));
Solution
The valid DELETE statements are:
b. DELETE FROM sales WHERE promo_id IN (SELECT promo_id FROM promotions WHERE promo_name = 'blowout sale' OR promo_name = 'everyday low price');
c. DELETE FROM sales WHERE promo_id = (SELECT promo_id FROM promotions WHERE promo_name = 'blowout sale') OR promo_id = (SELECT promo_id FROM promotions WHERE promo_name = 'everyday low price');
d. DELETE FROM sales WHERE promo_id IN (SELECT promo_id FROM promotions WHERE promo_name IN ('blowout sale','everyday low price'));
Option a is not valid because it's trying to match a single promo_id to two different promo_names at the same time, which is not possible. The correct way to do this is to use the IN operator or OR operator as shown in options b, c, and d.
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