比如分为 5个集合,那么就用某一列和5 取余 ,分别可以取 余数为 0、1、2、3、4 的结果集,那么就把集合分为5个小的集合了
1、取余数为 0 的集合
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 0
2、取余数为 1 的集合
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 1
3、取余数为 2 的集合
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 2
4、取余数为 3 的集合
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 3
5、取余数为 4 的集合
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 4
6、取整个集合所有返回
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 0
union
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 1
union
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 2
union
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 3
union
select *
from (select MOD(T.ID, 5) rest, t.* from T_AEMR_DOC t) a
where a.rest = 4