What are the potential consequences of using SELECT * in a SQL query in PHP?

Using SELECT * in a SQL query in PHP can lead to performance issues, as it retrieves all columns from the table, even if not all are needed. This can result in unnecessary data transfer and slower query execution. To solve this issue, explicitly specify the columns you need in the SELECT statement. 

// Specify the columns you need in the SELECT statement
$sql = "SELECT column1, column2, column3 FROM table_name WHERE condition = value";
$result = mysqli_query($conn, $sql);

// Process the query result
if (mysqli_num_rows($result) > 0) {
    while($row = mysqli_fetch_assoc($result)) {
        // Process each row
    }
} else {
    echo "0 results";
}

Keywords

SELECT * SQL query PHP performance data retrieval

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