What are the potential pitfalls of using SELECT * in PHP when joining tables?

Using SELECT * in PHP when joining tables can lead to performance issues and unnecessary data retrieval, as it fetches all columns from both tables even if they are not needed. To solve this issue, specify the exact columns needed in the SELECT statement to retrieve only the necessary data and improve query efficiency. 

// Specify the columns needed in the SELECT statement when joining tables
$query = "SELECT table1.column1, table1.column2, table2.column3 FROM table1 JOIN table2 ON table1.id = table2.id";
$result = mysqli_query($connection, $query);

// Fetch and use the results as needed
while ($row = mysqli_fetch_assoc($result)) {
    // Process the data
}

Keywords

SELECT * PHP joining tables performance data retrieval

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