Question

编辑使用COST 100使命令通过，但是，我仍然无法运行查询，因为它会产生此错误：

ERROR:  function group_concat(character) does not exist
HINT:  No function matches the given name and argument types. You may need to add explicit type casts.

我正在运行的查询是：

select tpid, group_concat(z) as z,                                                                                                                                                    
    group_concat(cast(r as char(2))) as r,                                                                                                                                   
    group_concat(to_char(datecreated,'DD-Mon-YYYY HH12:MI am')) as datecreated,                                                                                                        
    group_concat(to_char(datemodified,'DD-Mon-YYYY HH12:MI am')) as datemodified                                                                                                       
    from tpids group by tpid order by tpid, zip

这个功能似乎在本地工作正常，但在线移动会产生这个错误......有什么我不知道的吗？

CREATE OR REPLACE FUNCTION group_concat(text, text)
  RETURNS text AS
$BODY$
SELECT CASE
WHEN $2 IS NULL THEN $1
WHEN $1 IS NULL THEN $2
ELSE $1 operator(pg_catalog.||) ',' operator(pg_catalog.||) $2
END
$BODY$
  LANGUAGE 'sql' IMMUTABLE
  COST 100;
ALTER FUNCTION group_concat(text, text) OWNER TO j76dd3;

Answer 1

正如提示消息所述，您缺少存储过程的参数。它需要2个参数，但在您的列声明中：

group_concat(cast(r as char(2))) as r,
group_concat(to_char(datecreated,'DD-Mon-YYYY HH12:MI am')) as datecreated,
group_concat(to_char(datemodified,'DD-Mon-YYYY HH12:MI am')) as datemodified

你只提供一个。

因为PostgreSQL 8.4允许参数的默认值。请查看reference以获取更多信息和示例。

postgres - 错误：语法错误在“COST”或附近

1 个答案: