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    <p>You should have one table with one row for each user that exists, like you already do. Call it 'users'. This table will have only the information about the user, not which groups they are in.</p> <p>You should have another table with one row for each group, which you do. Call it 'groups'. This table will have only the information about the group, not who is in it.</p> <p>You should have a third table with one row for each user for each group they're in. Call it 'user_groups' or something. Each row in this table will link one user from the 'users' table to one group from the 'groups' table, and possibly give information about their subscription to that group.</p> <p>A sample setup may look like:</p> <pre><code>CREATE TABLE users ( userID INT, firstName VARCHAR, lastName VARCHAR, PRIMARY KEY (userID) ); CREATE TABLE groups ( groupID INT, groupName VARCHAR, adminUserID INT, /* this is the userID of the one and only administrator of this group */ PRIMARY KEY (groupID) ); CREATE TABLE user_groups ( userID INT, groupID INT, invited TINYINT, /* 0 or 1 to indicate true or false */ subscribed TINYINT /* 0 or 1 to indicate true or false */ ); </code></pre> <p><hr /> <strong>EDIT</strong> Answering question from comments:</p> <pre><code>$groupID = 1; $userIDArray = explode(",", $row["invitedusers"]); // assuming that $row is a row from the old group_data table foreach ($userIDArray as $userID) mysql_query("INSERT INTO user_groups (userID, groupID, invited) VALUES ('". mysql_real_escape_string($userID) ."', '". mysql_real_escape_string($groupID) ."', 1)"); </code></pre>
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    1. POProper table structure for creating groups and inviting users
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    1. POProper table structure for creating groups and inviting users
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    1. COAs for migrating the users, you can write a PHP script to do that. It shouldn't be terribly difficult for you.
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    2. COGoing to implement this now. Just one last question, How do I insert an array with the invited users into the user_groups? Let's say the admin selects 3 of his friends and I have them in a array, how do I put them into the user_groups?
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    3. COSee updated answer.
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