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* 假如：你已经建立了复合索引,ixm
use b1 in 0
use b2 in 0 order ixm
use b3 in 0 order ixm
sele b2
set relation to xm into b3
sele b1
set relation to xm into b2
use b1 in 0
use b2 in 0 order ixm
use b3 in 0 order ixm
sele b2
set relation to xm into b3
sele b1
set relation to xm into b2
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