将score按ID分组排名:row_number() over(partition by id order by score desc) 将score不分组排名:row_number() over(order by score desc) select id,area,score, row_number() over(partition by id order by score desc) 分组id排序, row_number() over(order by score desc) 不分组排序…
将score按ID分组排名:cume_dist() over(partition by id order by score desc)*sum(1) over(partition by id) 将score不分组排名:cume_dist() over(order by score desc)*sum(1) over() select id,area,score, sum(1) over() as 总数, sum(1) over(partition by id) as 分组个数, (cume_di…
将score按ID分组排名:rank() over(partition by id order by score desc) 将score不分组排名:rank() over(order by score desc) select id,area,score, rank() over(partition by id order by score desc) 分组id排序, rank() over(order by score desc) 不分组排序 from students order by i…
这里介绍2中方式:js代码如下 var arr=[1,7,3,2,1,4,12,3,"3",3] function compare(arr) { var result = [], isfl; for (var i = 0; i < arr.length; i++) { isfl= false; for (var j = 0; j < result.length; j++) { if (arr[i] ===result[j]) { isfl = true; break; }…
1.查询重复值: select code,count(*) as count from hospital group by code having count>1; 该语句查询code重复值大于1的记录 2.删除重复: DELETE FROM hospital WHERE id NOT IN (SELECT dt.minno FROM (SELECT MIN(id) AS minno FROM hospital GROUP BY code) dt); 该语句保留id最小的记录,其余code重复的…
1 查询重复值 ); 2 删除重复值 -- 创建临时表 ) ); -- 把重复数据放进临时表 INSERT Hb_Student_a SELECT id,studentNumber FROM Hb_Student ) ); -- 删除重复数据 DELETE a FROM Hb_Student AS a JOIN Hb_Student_a AS b ON a.id=b.id WHERE a.id=b.id ;…
