PostgreSQL不选择行分组

问题描述

我有疑问。有一个类似以下示例的构造：（online demo）

您将看到结果的created_at字段。我必须使用查询created_at字段。所以我必须在select created_at中使用它。我不想在select中使用它created_at字段。因为，在存款表中有数百万条记录。我该如何解决这个问题？

（注意：我有很多表要查询，例如“ deposits”表。这只是一个简短的示例。）

create table payment_methods
(
    payment_method_id bigserial not null
        constraint payment_methods_pkey
            primary key
);

create table currencies_of_payment_methods
(
    copm_id bigserial not null
        constraint currencies_of_payment_methods_pkey
            primary key,payment_method_id integer not null
    
);
 
create table deposits
(
    deposit_id bigserial not null
        constraint deposits_pkey
            primary key,amount numeric(18,2) not null,copm_id integer not null,created_at timestamp(0)
);

INSERT INTO payment_methods (payment_method_id) VALUES (1);
INSERT INTO payment_methods (payment_method_id) VALUES (2);

INSERT INTO currencies_of_payment_methods (copm_id,payment_method_id) VALUES (1,1);

INSERT INTO deposits (amount,copm_id,created_at) VALUES (100,1,'2020-09-10 08:49:37');
INSERT INTO deposits (amount,created_at) VALUES (200,created_at) VALUES (40,'2020-09-10 08:49:37');

查询：

SELECT     payment_methods.payment_method_id,deposit_copm_id.deposit_copm_id,manuel_deposit_amount.manuel_deposit_amount,manuel_deposit_amount.created_at
FROM       payment_methods
CROSS JOIN lateral
           (
                  SELECT currencies_of_payment_methods.copm_id AS deposit_copm_id
                  FROM   currencies_of_payment_methods
                  WHERE  currencies_of_payment_methods.payment_method_id = payment_methods.payment_method_id) deposit_copm_id
CROSS JOIN lateral
           (
                  SELECT sum(deposits.amount) AS manuel_deposit_amount,array_agg(deposits.created_at) AS created_at
                  FROM   deposits
                  WHERE  deposits.copm_id = deposit_copm_id.deposit_copm_id) manuel_deposit_amount
WHERE      payment_methods.payment_method_id = 1

解决方法

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