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I am new to the wordpress and want to create a plugin but $wpdb is not initiating, I am using wordpress version 4.9.4

Here is my code snippet

global $wpdp;
$sql    = 'SELECT * From '.$wpdp->prefix.' my_first_plugin';
$result = $wpdp->get_results($sql); 
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    Where is this code? (in which hook/filter) Did you check for errors? (your SQL query is invalid)
    – kero
    Feb 14 '18 at 10:38
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You have written $wpdb incorrectly (3x) in your code example. If it is an exact copy it will never work. And you have a space in your SQL after prefix.' which shouldn't be there. And 'From' shoul dbe all caps.

Try this:

global $wpdb;
$sql    = 'SELECT * FROM ' . $wpdb->prefix . 'my_first_plugin';
$result = $wpdb->get_results($sql); 

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