Not able to create multiple custom db tables on activation of wp Plugin

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i am unable to create multiple custom tables in db on activation of my wordpress plugin it creates only the last table like mentioned in this code is “Bookmark” instead of creating all tables (user,field,visibility,notify) etc 

function your_plugin_options_install() {
    global $wpdb;
    //global $your_db_name;
    $uservar = $wpdb->prefix . 'user';
    $fieldvar = $wpdb->prefix . 'field';
    $visibilitytypevar = $wpdb->prefix . 'visibily';
    $notificationvar = $wpdb->prefix . 'notification';
    $jobtypevar = $wpdb->prefix . 'jobtype';
    $bookmarkvar = $wpdb->prefix . 'bookmark';
   // $profiledatavar = $wpdb->prefix . 'profiledata';
    //$employeevar = $wpdb->prefix . 'employee';
 //echo "some";
    // create the ECPT metabox database table
    //if($wpdb->get_var("SHOW TABLES LIKE '$yourtable'") != $yourtable) 
    //{
        $sql = "CREATE TABLE IF NOT EXISTS " . $uservar . " (
        `u_id` int(20) NOT NULL AUTO_INCREMENT,
        `u_name` varchar(30) ,
        `u_phonenumber` int(20) ,
        `u_email` varchar(30) NOT NULL,
        `u_password` varchar(50) NOT NULL,
         PRIMARY KEY (u_id)
         );";
          $sql = "CREATE TABLE IF NOT EXISTS " . $fieldvar . " (
         `f_id` int(20) NOT NULL AUTO_INCREMENT ,
         `f_title` varchar(30) NOT NULL,
          PRIMARY KEY (f_id)
         );";

         $sql = "CREATE TABLE IF NOT EXISTS " . $visibilitytypevar . " (
         `v_id` int(20) NOT NULL AUTO_INCREMENT ,
         `v_type` bool NOT NULL,
          PRIMARY KEY (v_id)
         );";

         $sql = "CREATE TABLE IF NOT EXISTS " . $notificationvar . " (
         `n_id` int(20) NOT NULL AUTO_INCREMENT ,
         `u_id` int(20) NOT NULL,
         PRIMARY KEY (n_id)
         );";

         $sql = "CREATE TABLE IF NOT EXISTS " . $jobtypevar . " (
         `jt_id` int(20) NOT NULL AUTO_INCREMENT ,
         `jt_title` varchar(30),
         PRIMARY KEY (jt_id)
         );";

          $sql = "CREATE TABLE IF NOT EXISTS " . $bookmarkvar . " (
         `bm_id` int(20) NOT NULL AUTO_INCREMENT ,
         `u_id` int(20) NOT NULL,
         `bm_title` varchar(30),
         PRIMARY KEY (bm_id)
         );";


        require_once(ABSPATH . 'wp-admin/includes/upgrade.php');
        dbDelta($sql);
    }

//}
// run the install scripts upon plugin activation
register_activation_hook(__FILE__,'your_plugin_options_install');
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4 comments

  1. you are overriding your $sql variable.
    Just use dbDelta function after every query.
    like below format. 

    require_once(ABSPATH . 'wp-admin/includes/upgrade.php');

// your first query
$sql = '...'; 
dbDelta($sql);

// your second query
$sql = '...'; 
dbDelta($sql);

.
.
.


// your nth query
$sql = '...'; 
dbDelta($sql);

  2. It happens, because in your function, you are always rewriting your $sql variable, before you execute them. This is why only the last is executed.

    After every $sql definition, run the query.

    //define the query
$sql = "CREATE TABLE `firsttable` ....";
//Run the query
dbDelta($sql); //If this is what is running the query.
//Another table
$sql = "CREATE TABLE `secondtable` ....";
//Run the new query
dbDelta($sql); //If this is what is running the query.

  4. You can also try something like this:

    for first query wright $sql = "your query text goes here",

    and for all next queries $sql .= "your query text goes here"