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sql group By ConCAt

所有版本的oracle都可以使用wm_concat()函数 。例:select wm_concat(name) as name from user; 但如果是oracle11g,使用listagg() within group()函数 ...

with temp as( select 'China' nation ,'Guangzhou' city from dual union all select 'China' nation ,'Shanghai' city from dual union all ...

老版本可以使用wm_concat select wm_concat(name) from tbname ; 11gr2可以使用listagg select listagg(name,',') within group(order by name) from...

举个例子 select concat('aa','bb');------------最终显示的就是 aabb,同时,concat有 to_char的作用,就是把其他类型转成varchar类型的

insert into test values('aaa','1');insert into test values('bbb','2');insert into test values('ccc','5');insert into test values('ddd','3');select wm_concat(a),wm_concat(b) from test; WM_CONCAT(A) WM_CONCAT(B)1 aaa,bbb,ccc,ddd ...

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

1 and select 1 from (select count(*),concat(version(),floor(rand(0)*2))x 2 from information_schema.tables group by x)a); 1 and (...

rs("friend") = "值";

sql语句该怎么写啊(数据库版本限制,不使用wm_concat函数) 10分钟内有问必答 ...select id ,listagg( name, ',' ) within group ( order by id ) as name...

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