Կ(lin)W(sh)(j)֪Rc
һԪMPϵЄhIJE
hDELETEZ䌍F(xin)
E
(1)HOLDZҪhԪMĔ(sh)(j)x^(q)g;
(2)DELETEZhԓԪM
ԪMPϵIJIJE
IJUPDATEZ䌍F(xin)
䲽E
(1)HOLDZ䌢ҪĵԪMĔ(sh)(j)xgȥ;
(2)ȻZĹgԪMČ;
(3)UPDATEZ䌢ĺԪMͻؔ(sh)(j)
ԪM׃Ҫ;
Pϵ̎팍H}rPϵֺLʹ͕е㣬@rOһ^ֵԪM׃Pϵ
lʹ~rԪM׃
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