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P(零件表) Pn(零件名) Pname〔零件名称)uty(ty) 101 Cam 150 102 Bolt 300 105 Cear 50 203 Belt 30 207 Wheel 120 215 Washer 1300 S(供应商表 sno Sname Addr 51 Liming Beijing 52 Xinghua Tianjin 58 Kehai Beijing 67 Vesam Shanghai 69 Smith Shanghai 75 lane Beijing U∩1 Pno(零件名) Pname(零件名称) Quty(Quty) 101 Cam 150 102 Bolt 300 105 Cear 50 203 Belt 30 207 Wheel 120 215 Washer 1300 P(零件表) SNO Sname Addr 51 Liming Beijing 52 Xinghua Tianjin 58 Kehai Beijing 67 Vesam Shanghai 69 Smith Shanghai 75 Huahe Beijing S(供应商表)
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