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CHECK equvivalance bw given concurrent schedule nd serial schedule T1 T4 T3 T2
                              given schedule       serial schedule (T1 T4 T3 T2)
1) initial read            T4 T3 T2   on x              T4 T3 T2 on x
2) updated read       on y T1:W(y) --> T4:R(y)        on y T1:W(y) --> T4:R(y)
3) Final write             on y T2 , on z T2                  on y T2 , on z T2
hece it is view equivalent to serial schedule T1 T4 T3 T2 nd conflict serializable also
                                                             or
conflict serializable  ------->  view serializable
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