Custom Mysql Query Magento2

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$objectManager = \Magento\Framework\App\ObjectManager::getInstance(); // Instance of object manager
$resource = $objectManager->get('Magento\Framework\App\ResourceConnection');
$connection = $resource->getConnection();
$tableName = $resource->getTableName('employee'); //gives table name with prefix
 
//Select Data from table
$sql = "Select * FROM " . $tableName;
$result = $connection->fetchAll($sql); // gives associated array, table fields as key in array.
 
//Delete Data from table
$sql = "Delete FROM " . $tableName." Where emp_id = 10";
$connection->query($sql);
 
//Insert Data into table
$sql = "Insert Into " . $tableName . " (emp_id, emp_name, emp_code, emp_salary) Values ('','XYZ','ABD20','50000')";
$connection->query($sql);
 
//Update Data into table
$sql = "Update " . $tableName . "Set emp_salary = 20000 where emp_id = 12";
$connection->query($sql);

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