How to Fix Laravel's 'Syntax error or access violation: 1055 Error' with WhereIn and GroupBy?

Troubleshooting Laravel "Syntax error or access violation: 1055 Error" when Using WhereIn and GroupBy

In Laravel, combining WhereIn and GroupBy in a single query can sometimes lead to the "Syntax error or access violation: 1055 Error." This is because of a MySQL configuration setting called strict.

Short Answer

In the config/database.php file, you can disable all strict options by setting:

'mysql' => [
    'strict' => false
]

Detailed Answer

Instead of disabling all strict options, you can also selectively allow grouping by one column by adding the ONLY_FULL_GROUP_BY mode:

'mysql' => [
    ...
    'strict' => true,
    'modes' => [
        'ONLY_FULL_GROUP_BY'
    ]
]

For a complete discussion on this issue, refer to the following answer:

[GitHub Issue: "Syntax error or access violation: 1055 Error" when Combining WhereIn and GroupBy](https://github.com/laravel/framework/issues/2981)

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