-- for M$SQL:
/* A,B 存在后，B,A组合等效，不再入库 */
select a.name + ', ' + b.name
from tb as a, tb as b
where a.name < b.name
select a.name + ', ' + b.name + ', ' + c.name
from tb as a, tb as b, tb as c
where a.name < b.name
and b.name < c.name
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