Skip to main content

GRANT and REVOKE in MySQL

DCL commands are used to enforce database security in multiple user database environments. Two types of DCL commands are GRANT and REVOKE. Only Database Administrator's or owner's of the database object can provide/remove privileges on a database object.
SQL GRANT is a command used to provide access or privileges on the database objects to the users
Syntax-
  1. GRANT privilege_name
  2. ON object_name
  3. TO {user_name |PUBLIC |role_name}
  4. [WITH GRANT OPTION];
  5.  
  6.  
  7. CREATE ROLE testing
  8. GRANT CREATE TABLE TO testing;
The REVOKE command removes user access rights or privileges to the database objects.
  1. REVOKE privilege_name
  2. ON object_name
  3. FROM {user_name |PUBLIC |role_name}
  4.  
  5. REVOKE CREATE TABLE FROM testing;

Comments

Popular posts from this blog

Code for Mail in PHP

PHP mail function and mail configuration in  XAMPP  and sending mail is done from sendmail through localhost. I hope it will help you. mail() function <? php $to = 'dubeynitish22@hotmail.com' ; $subject = 'Test' ; $message = 'Hello' ; $headers = 'From: webmaster@example.com' . "\r\n" . 'Reply-To: webmaster@example.com' . "\r\n" . 'X-Mailer: PHP/' . phpversion ();   if (! mail ( $to , $subject , $message , $headers )){ echo "Error !!" ; } else { echo "Email Sent !!" ; } ?> 2. php.ini configuration (For SEND-MAIL) [ mail function ] ; For Win32 only . ; http : //php.net/smtp ; SMTP = localhost ; http : //php.net/smtp-port ; smtp_port = 25   ; For Win32 only . ; http : //php.net/sendmail-from ; sendmail_from = me@example . com   ; For Unix only . You may supply arguments as well ( default : "sendmail -t -i&q

PHP code for finding distinct elements common to all rows of a matrix in O(n) time complexity

<?php class Matrix{ /** •@param 2D array $matrix • •Prints distinct elements common to all rows of the matrix */ public static function getDistinctElementsCommonToAllRows($matrix){ // A hash map to store count of elements $hashmap = array(); $selectedHash = array(); $rows = count($matrix); $cols = count($matrix[0]); for ($i = 0; $i < $rows; $i++) { // Increment the count of first // element of the row if(array_key_exists($matrix[$i][0],$hashmap)){ $hashmap[$matrix[$i][0]] = $i+1; } // Starting from the second element // of the current row for ($j = 1; $j < $cols; $j++) { // If current ele

PHP code for Implementing LRU cache.

<?php interface LRUCache{ /** •@param string $key •@param string $value •@return bool $result • •Stores value against the key in the cache */ public function insertIntoCache($key,$value); /** •@param string $key •@return string $value •Gets the value of a key from the cache */ public function getFromCache($key); /** Purge the entire cache */ public function purgeCache(); /** •@return int $count •Gets the number of successful cache hits so far */ public function allCacheHits(); /** •@return int $count •Gets the number of unsuccessful cache hits so far **/ public function allCacheMissed(); } class Cache implements LRUCache{ // int the max number of elements the cache supports private $capacity; // Array representing a naive hashmap (TODO needs to pass t