What are the differences between a left join and an equi join in PHP database queries?

In PHP database queries, a left join includes all the records from the left table (the first table mentioned in the query) and only the matching records from the right table, while an equi join only includes the records that have matching values in both tables. To implement a left join in a PHP database query, you can use the following code snippet: 

$sql = "SELECT * FROM table1 LEFT JOIN table2 ON table1.id = table2.id";
$result = $conn->query($sql);
```

To implement an equi join in a PHP database query, you can use the following code snippet:

```php
$sql = "SELECT * FROM table1 INNER JOIN table2 ON table1.id = table2.id";
$result = $conn->query($sql);

Keywords

left join equi join PHP database queries differences

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