通过出生年月，分组查询人口年龄段人数

“` select sum( case when (0<=age and age <6 )then psum else 0 end) psum1 , sum( case when (6<=age and age <18) then psum else 0 end) psum2, sum( case when (18<=age and age <30) then psum else 0 end) p

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