Array
(
    [0] => Array
        (
            [Field] => chat_id
            [Type] => int(11)
            [Null] => NO
            [Key] => PRI
            [Default] => 
            [Extra] => 
        )

    [1] => Array
        (
            [Field] => user_id
            [Type] => int(11)
            [Null] => NO
            [Key] => PRI
            [Default] => 
            [Extra] => 
        )

    [2] => Array
        (
            [Field] => joined_at
            [Type] => timestamp
            [Null] => YES
            [Key] => 
            [Default] => current_timestamp()
            [Extra] => 
        )

    [3] => Array
        (
            [Field] => last_read_message_id
            [Type] => int(11)
            [Null] => YES
            [Key] => 
            [Default] => 0
            [Extra] => 
        )

)

---
Array
(
)

---
Array
(
)