PostgreSQL:使用最大值联接2个数组

我有一个有2条记录的表（说明性目的）

我想选择这两个值并将它们合并在一起
要获得在这种情况下生成结果的最高值，请执行以下操作：

{1,1,0}

访问数组可以增加到200多个值，因此我希望避免在编程代码（golang）中这样做

基本上与这个问题相同：但在我的例子中，分离的列被合并到一个带有数组的字段中

更新

行（访问）

数组的值总是相同的

尝试此查询（）：

---

二进制数组

如果数组仅包含“0”和“1”，并且具有相同数量的值：

create table merge_binary_test (id int, access int[]);
insert into merge_binary_test values
(1, '{0,1,0,1}'),
(2, '{1,0,0,1}');

select string_to_array(bit_or(elem)::text, null)::int[]
from (
    select id, array_to_string(access, '')::varbit elem
    from merge_binary_test
    where id in (1,2)
    ) sub

 string_to_array
-----------------
 {1,1,0,1}
(1 row) 

---

以以下为例：

create table arr(id int,access int[]);
insert into arr values (1,'{0,1,0}'),(2,'{0,1,0}'),(3,'{0,0,9}');

因此，这些行将：

id access  
-- ------- 
1  {0,1,0} 
2  {0,1,0} 
3  {0,0,9} 

现在可以创建一个函数来合并数组行，如下所示：

CREATE
    OR replace FUNCTION merge_array (
    arrval INT -- the total number of values in an array in my example its 3, but 200 is for yours
    ,tbl TEXT --name of the table in which you want perform this function,
    ,col TEXT -- name of the array col
    )
RETURNS setof INTEGER [] AS $$

DECLARE qry TEXT;

BEGIN
    SELECT format('select translate(string_to_array(x.*::text,'','')::text,''()'','''')::int[] from (select %s  from (select ' || col || ' ar  from  ' || tbl || ' ) as sq) as x ', egn)
    INTO qry
    FROM (
        SELECT string_agg('max(ar[' || val || '])', ',') egn
        FROM (
            SELECT generate_series(1, arrval) val
            ) t
        ) tt;

    RETURN QUERY

    EXECUTE (qry);
END;$$

LANGUAGE plpgsql

用法：

选择合并数组（3，'arr'，'access'）

结果:

是，

每行（访问）

具有相同数量的值

id access  
-- ------- 
1  {0,1,0} 
2  {0,1,0} 
3  {0,0,9} 

CREATE
    OR replace FUNCTION merge_array (
    arrval INT -- the total number of values in an array in my example its 3, but 200 is for yours
    ,tbl TEXT --name of the table in which you want perform this function,
    ,col TEXT -- name of the array col
    )
RETURNS setof INTEGER [] AS $$

DECLARE qry TEXT;

BEGIN
    SELECT format('select translate(string_to_array(x.*::text,'','')::text,''()'','''')::int[] from (select %s  from (select ' || col || ' ar  from  ' || tbl || ' ) as sq) as x ', egn)
    INTO qry
    FROM (
        SELECT string_agg('max(ar[' || val || '])', ',') egn
        FROM (
            SELECT generate_series(1, arrval) val
            ) t
        ) tt;

    RETURN QUERY

    EXECUTE (qry);
END;$$

LANGUAGE plpgsql

merge_array 
----------- 
{0,1,9}