摘要:
SpecialGroup.group(:special_type).countselect special_type,count(*) from special_groups group by special_type SpecialGroup.group(:special_type).count( 阅读全文
posted @ 2018-06-12 11:00
吕兴杰
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摘要:
Table.select("DISTINCT name").map(&:name) : DISTINCT name去重查询name Table.active.map{|x| x.name}.uniq :查询出来后做去重操组 阅读全文
posted @ 2018-06-12 10:14
吕兴杰
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