Question

我从我创建的交叉表中拉出所有column_names（cname1）。这些列名称有数千个，因此我将它们组合成一个数组。然后我想使用动态sql（或其他任何工作）来使用这些column_names来根据相同交叉表的记录创建一个数组。我一直收到错误：

ERROR: missing "LOOP" at end of SQL expression

CREATE OR REPLACE FUNCTION mffcu.test_ty_hey()
 RETURNS setof record
 LANGUAGE plpgsql
AS $function$
Declare
       cname1 text;         
Begin 

for cname1 in select array_agg(column_name) as useme
from(
select column_name::text
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'crosstab_183' 
and ordinal_position != 1
) as fin
join mffcu.crosstab_183 a on fin.id = a.id;

loop  
sql2 ='select distinct array['|| columnname ||'] from mffcu.crosstab_183';
execute sql2;
end loop;
END;
$function$

我不能为我的生活弄清楚为什么我会收到这个错误。

Answer 1

for cname1 in select array_agg(column_name) as useme
from(
select column_name::text
FROM INFORMATION_SCHEMA.COLUMNS
WHERE TABLE_NAME = 'crosstab_183' 
and ordinal_position != 1
) as fin
join mffcu.crosstab_183 a on fin.id = a.id; --here should not be semicolon!
loop

动态Sql：使用列名称数组从记录创建数组

1 个答案: