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group ConCAt

group是分组 也可以去重使用 concat是函数 字符串连接使用

concat() 方法用于连接两个或多个数组。 var arr = new Array(3) arr[0] = "George" arr[1] = "John" arr[2] = "Thomas" var arr2 = new Array(3) arr2[0] = "James" arr2[1] = "Adrew" arr2[2] = "Martin" document.write(arr.concat(arr2)) 输...

mysql中CONCAT的用法如下: 1.>CONCAT拼接字符串 SELECT CONCAT('HELLO', ' WORLD') AS expr >GROUP_CONCAT可以和GROUP BY语句一起用 SELECT GROUP_CONCAT(name) AS names FROM xxx 2.SELECT GROUP_CONCAT(name) AS names FROM xxx GROUP BY yy ...

group_concat(SKT7.SKF76,skt7.SKF77) 部分改成 group_concat(case when SKT7.SKF76=skt7.SKF77 then SKT7.SKF76 else CONCAT(SKT7.SKF76,skt7.SKF77) end)

所有版本的oracle都可以使用select wm_concat(name) as name from user; 但如果是oracle11g,使用select listagg(name, ',') within group( order by ...

SELECT a.*,group_concat(b.picture_path) FROM ep_pollution_comments a LEFT JOIN ep_pollution_comments_picture b ON a.comments_id = b.comments_id group by a.comments_id,a.pollution_id,a.comments_chile,a.comments_info, a.create_ti...

可直接用嵌套查询。 方法如下: 如数据: id name 1 a 1 b 2 c 2 d 3 e 3 f 3 g 3 h 1 2 select count(t.counts) from (select id,count(*) counts from 表名 group by id) t

SELECT A.[年级], A.[姓名], GroupConcat('科目','学生科目','姓名=' & "'" & 姓名 & "'" & 'AND 年级=' & "'" & 年级 & "'") AS 选择科目FROM 学生科目 AS AGROUP BY A.[年级], A.[姓名]ORDER BY 1 DESC,2;执行结果:

使用交叉表查询就可以实现分组 或者使用合并字段的方法 http://www.accessoft.com/article-show.asp?id=8496

select replace(concat('''',channel,''''),',',''',''') from tb_user where id='1';这样么

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