一个标准sql语句模板,
select distinct top n * from t1 inner join t2 on ... join t3 on ... where ... group by ... having ... order by ...
top n:选出查询结果的前n项,可改为 top n percent 形式:选出查询结果的前百分之n项;
inner join:内连接查询,可改为left join(左连接)、right join(右连接);
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