ORACLE字符串连接分组串聚函数 wmsys.wm_concat SQL代码: select grp, wmsys.wm_concat(str) grp, 'a1' str from dual union grp, 'a2' str from dual union grp, 'b1' str from dual union grp, 'b2' str from dual union grp, 'b3' str from dual) t group by grp 执行效果: 原始数据 分组聚合后
项目开发中,我们有时会碰到需要分组排序来解决问题的情况,如:1.要求取出按field1分组后,并在每组中按照field2排序:2.亦或更加要求取出1中已经分组排序好的前多少行的数据 这里通过一张表的示例和SQL语句阐述下oracle数据库中用于分组排序函数的用法. a.row_number() over() row_number()over(partition by col1 order by col2)表示根据col1分组,在分组内部根据col2排序,而此函数计算的值就表示每组内部排序后的顺序
create or replaceFUNCTION "SF_SPLIT_ACCOUNT_ID_LIST" ( account_id_list IN VARCHAR2)RETURN VARCHAR2 ASv_account_id_list VARCHAR2(5000); BEGIN WITH ACCTS AS (SELECT DISTINCT str from (SELECT REGEXP_SUBSTR(replace(account_id_list,', ',','), '[^,]+'
原文链接:https://blog.csdn.net/cizatu5130/article/details/100291347 oracle sum()聚合函数 2016-05-13 20:08:00 cizatu5130 阅读数 8 Oracle 的sum聚合函数的功能就是求和(这里暂时不讨论分析函数用法),一般用法不多讲,有个用法比较令人疑惑,曾经也踩过它的坑.示例如下: declare cursor t_cur is select * from emp where e
方法1 CREATE OR REPLACE FUNCTION public.sfun_test1( results numeric[], val numeric) RETURNS numeric[] LANGUAGE 'plpgsql' COST VOLATILE AS $BODY$ BEGIN results :=array_append(results,val); RETURN results; END; $BODY$; ALTER FUNCTION public.sfun_test1(nu
SELECT DISTINCT(proname) FROM pg_proc WHERE proisagg order by proname 查所有 SELECT * FROM pg_proc WHERE proname like 'agg%' AND proisagg; 查所有agg开头的 CREATE AGGREGATE agg_o3_8h(BASETYPE = numeric,SFUNC = sfun,STYPE = numeric[],FINALFUNC = sffun_o3_8h); C
不多说了,说明后面是完整的代码,用来将字符串型的字段的各行的值拼成一个大字符串,也就是通常所说的Concat 例如有如下表dict ID NAME CATEGORY 1 RED COLOR 2 BLUE COLOR 3 APPLE FRUIT 4 ORANGE FRUIT 执行SQL语句:select category,dbo.concatenate(name) as names from dict group by category. 得到结果表如下 category