Laravel 4 Query Builder: LEFT JOIN ... AND ... query
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
# Mastering Complex Joins in Laravel: The LEFT JOIN with AND Condition
As a senior developer, I often find that the most complex data retrieval tasks—especially those involving many-to-many relationships like pivot tables—can seem daunting when translating raw SQL into an ORM structure. The scenario you've presented—merging data from `runs` with specific details from `run_user` based on matching IDs—is a classic database challenge.
While your raw SQL approach using `LEFT JOIN ... ON condition1 AND condition2` is perfectly valid and efficient, the goal when moving to Laravel is to find the most idiomatic and readable way to express that relationship within the Query Builder.
This post will walk you through how to achieve this specific type of conditional joining in Laravel, focusing on the Query Builder, and explore why certain patterns are preferred over others.
## Understanding the SQL Foundation
Your raw SQL query is an excellent starting point:
```sql
SELECT
runs.startpoint,
runs.startpostcode,
run_user.completed,
-- ... other columns
FROM runs
LEFT JOIN run_user ON run_user.run_id = runs.id AND run_user.user_id = '2'
```
The key here is that placing multiple conditions (`AND`) within the `ON` clause of a `JOIN` dictates *which* rows are successfully linked. If you use a `LEFT JOIN`, you ensure all records from the primary table (`runs`) are kept, even if no matching pivot record exists in `run_user`.
The difficulty in translating this directly into Laravel's Query Builder often stems from how Eloquent/Query Builder handles filtering versus joining logic.
## The Laravel Query Builder Approach
When working with relationships (like your pivot table), the most idiomatic Laravel approach is usually to define those relationships first and then use them to scope your queries. However, if you need a direct, complex join on raw tables, we can utilize the `join` method provided by the Query Builder.
Since you are filtering based on both the primary key relationship (`run_id = runs.id`) *and* an external condition (`user_id = '2'`), we must ensure both parts are explicitly linked in the join statement.
Here is how you would structure this using the Laravel Query Builder:
```php
use Illuminate\Support\Facades\DB;
$userId = 2;
$results = DB::table('runs')
->leftJoin('run_user', function ($join) use ($userId) {
// This is where you define the complex ON condition.
$join->on('run_user.run_id', '=', 'runs.id')
->where('run_user.user_id', $userId); // Applying the user filter here
})
->select([
'runs.startpoint',
'runs.startpostcode',
'run_user.completed',
'run_user.sticky',
'run_user.last_tested',
'run_user.difficulty'
])
->get();
```
### Explanation of the Code
1. **`DB::table('runs')`**: We start with our primary table.
2. **`leftJoin('run_user', function ($join) use ($userId) { ... })`**: Instead of passing a simple string for the join condition, we pass a closure. This allows us to use methods on the join object itself, which is crucial for complex conditional joins.
3. **`$join->on('run_user.run_id', '=', 'runs.id')`**: This handles the primary link between the two tables (the standard foreign key relationship).
4. **`->where('run_user.user_id', $userId)`**: By placing this `where` clause *inside* the join's condition, we effectively filter the joined results to only those pivot records matching the specific user ID you are interested in