What is selecting data in MySQL?

Selecting data in MySQL involves retrieving specific information from one or more tables in a database. The SELECT statement is used to accomplish this and can be customized to return only the data needed, filtered or sorted based on certain criteria.

For example, you can select all records from a table, or you can specify which columns to retrieve. You can also apply conditions to return only the records that meet certain criteria using the WHERE clause.

Example of Selecting Data

<?php // Connect to the database $mysqli = new mysqli("localhost", "username", "password", "database"); // Check connection if ($mysqli->connect_error) { die("Connection failed: " . $mysqli->connect_error); } // SQL query to select data $sql = "SELECT id, name, age FROM users WHERE age > 25"; $result = $mysqli->query($sql); // Check and output the results if ($result->num_rows > 0) { while($row = $result->fetch_assoc()) { echo "ID: " . $row["id"]. " - Name: " . $row["name"]. " - Age: " . $row["age"]. "<br>"; } } else { echo "0 results"; } // Close connection $mysqli->close(); ?>

MySQL SELECT statement data retrieval SQL query WHERE clause database

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