[Lorenc_]

pawn Код:

new clanquery[300];
                        format(clanquery, sizeof(clanquery), "UPDATE clans SET clanmotd = '%s' WHERE clanname = '%s'", new_motd, GetPlayerClan(playerid));

There are so many things you need to optimize.

pawn Код:

ChangeClanMOTD(playerid, "DROP TABLE clans;");

Probably exploitable like that, make protection against SQL injections too.

I might create a improved version soon, when I have the time.