③查询至少使用了厂家S1所提供的全部零件的工程名。
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答 案：③SELECT Jname FROM JWHERE NOT EXISTS(SELECT* FROM SPJ SPJX WHERE Sno='S1'AND NOT EXISTS (SELECT* FROM SPJ SPJY WHERE SPJX.Pno=SPJY.Pn
③SELECT Jname FROM JWHERE NOT EXISTS(SELECT* FROM SPJ SPJX WHERE Sno='S1'AND NOT EXISTS (SELECT* FROM SPJ SPJY WHERE SPJX.Pno=SPJY.Pn 解析：考查对于复杂关系的代数转换，通过EXISTS或NOT EX- ISTS实现。