Optimizing SQL Queries for Performance

Provide a practical example of optimizing SQL queries in a RAG integrated system, including indexing, query optimization, and execution plans.
/* HTML to display SQL execution result (not the actual optimization code) */
<div id='sql-result'></div>
HTML div element to display optimized SQL query results in a web page.
/* CSS to style the SQL result for readability */
#sql-result {
    padding: 10px;
    margin-top: 10px;
    border: 1px solid #ddd;
    background-color: #f9f9f9;
CSS styles for the SQL result div to improve the visibility and layout on the webpage.
/* JavaScript to fetch and display the optimized SQL query result */
async function fetchAndDisplaySQLResult() {
    try {
        const response = await fetch('/optimized-sql-query');
        const data = await response.json();
        const resultElement = document.getElementById('sql-result');
        // Assuming the data is just plain text for demonstration
        resultElement.innerText = data.result;
    } catch (error) {
        console.error('Error fetching optimized SQL query result:', error);

// Run the fetch function on page load
window.addEventListener('load', fetchAndDisplaySQLResult);
JavaScript function to fetch the result of an optimized SQL query from a server endpoint and display it on the webpage.