Oracle 19c 新特性 —— 列转行函数listagg的加强史

12.1之前 Oracle 12c以前有一个内部函数wm_concat，用法相似sql SELECT u.userid, u.usercode, u.username,wm_concat(to_char(r.rolename)) FROM S_U_R ur, S_U u, S_R r WHERE ur.userid = u.userid AND ur.roleid = r.roleid and u

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