2013
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2
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1
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1
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3
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ALTER
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DROP
2
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SQL
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ALTER
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淇敼鍩烘湰琛?/p>
3
锛屽疄楠屾楠?/p>
1
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spj
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SPJ
涓讳唬鐮?/p>
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PNO
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JNO)
澶栭儴浠ｇ爜
SNO
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SNO
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澶栭儴浠ｇ爜
PNO
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2
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SPJ
鏁版嵁搴擄紝骞跺湪
SPJ
鏁版嵁搴撲腑鍒涘缓鏍囧噯銆?/p>
P
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J