获取具有一个不同列的查询，Laravel

Question

在 customer_names 中，我得到一个值数组，从那里我只想得到第一个 created_at 值。使用我当前的代码，我得到了多行，其中的所有值都来自 customer_names.

$query = $this->customer->newQuery()->select(
      'customers.id',
      'customers.sage_id',
      'customers.account_name',
      'customer_names.name as name',
      'customer_names.novation_date as novation_date',
    )->withCount('contracts');
$query->leftJoin('customer_names', 'customers.id', 'customer_names.customer_id')->groupBy('customers.sage_id');

我也尝试了另一种方法，但我得到了一个空数组：

$query = $this->customer->newQuery()->with([
    'customerNames' => function ($query){
        $query->oldest()->first();
    }
])

"SQLSTATE[42803]: Grouping error: 7 ERROR: column "customer_names.novation_date" must appear in the GROUP BY clause or be used in an aggregate

如果我将其添加到 groupBy 以及名称和 ID，我不会收到任何错误，但结果是一样的。

Answer 1

左连接错误，请尝试以下格式

$query = customers::newQuery();

$query->select('customers.id','customers.sage_id','customers.account_name','customer_names.name as name','customer_names.novation_date as novation_date',)->withCount( 'contracts');

$query->leftJoin('customer_names', 'customer_names.id', '=' ,customers.customer_id')->groupBy('customers.sage_id');

如果您需要不同的列，请在您的查询中添加 distinct() 方法

Answer 2

您必须在 Laravel 应用程序中关闭严格模式。

转到config/database.php

下MySQL集

strict => false

它会开始工作。

这里是数据库设置

'mysql' => [
            'driver' => 'mysql',
            'url' => env('DATABASE_URL'),
            'host' => env('DB_HOST', '127.0.0.1'),
            'port' => env('DB_PORT', '3306'),
            'database' => env('DB_DATABASE', 'forge'),
            'username' => env('DB_USERNAME', 'forge'),
            'password' => env('DB_PASSWORD', ''),
            'unix_socket' => env('DB_SOCKET', ''),
            'charset' => 'utf8mb4',
            'collation' => 'utf8mb4_unicode_ci',
            'prefix' => '',
            'prefix_indexes' => true,
            'strict' => false,
            'engine' => null,
            'options' => extension_loaded('pdo_mysql') ? array_filter([
                PDO::MYSQL_ATTR_SSL_CA => env('MYSQL_ATTR_SSL_CA'),
            ]) : [],
        ],

如果您使用的是 Postgres

然后您必须将所有列添加到您在 SELECT

中提到的组中

$query = $this->customer->newQuery()->select(
      'customers.id',
      'customers.sage_id',
      'customers.account_name',
      'customer_names.name as name',
      'customer_names.novation_date as novation_date',
    )->withCount('contracts');
$query->leftJoin('customer_names', 'customers.id', 'customer_names.customer_id')->groupBy(['customers.sage_id', 'customers.account_name', 'name', 'novation_date']);

获取具有一个不同列的查询，Laravel

Get query with one distinct column, Laravel

laravel

laravel-7

如果您使用的是 Postgres