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【单选题】
物理优化中,连接操作的启发式规则执行顺序为( )。(1)如果一个表在连接属性上有索引,则可以选用索引连接算法(2)如果2个表都已经按照连接属性排序,则选择排序-合并算法(3)如果I和II都不是用,其中一个表较小,则可以选用Hash Join算法(4)使用嵌套循环算法,并选择其中较小的表作为外表
A.
( 2 )( 4 )( 1 )( 3 )
B.
( 2 )( 1 )( 3 )( 4 )
C.
( 1 )( 4 )( 2 )( 3 )
D.
( 1 )( 2 )( 3 )( 4 )
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