SQL What's wrong with my query

Question

SELECT 'name'  FROM 'players' WHERE 'id' IN
    (SELECT 'player_id' from 'players_online' WHERE 'frags'=
    (SELECT MAX(frags) FROM 'players_online')) 
AND 'name' is not null LIMIT 1;

There are two tables, in second one there are important maximum of column called frags and i want to extract a name from table 1 where columns id and player_id have this same values. When i check it with no single quotes it works but i need to keep a quotes cause of lua script phraser return a bool expression not a string

Lua code:

BestPAl=db.storeQuery("SELECT name FROM players WHERE id IN(SELECT player_id from players_online WHERE frags=(SELECT MAX(frags) FROM players_online)) AND name is not null LIMIT 1;")
BestPA=result.getDataString(BestPAl)'code'

Answer 1

You don't need quotes for table and field names. Try it like this

SELECT name FROM players WHERE id IN(SELECT player_id from players_online WHERE frags=(SELECT MAX(frags) FROM players_online)) AND name is not null LIMIT 1;

Answer 2

Ok, result of this problem may look like a solution before:

local BestPAl=db.storeQuery("SELECT `player_id` FROM `players_online` ORDER BY `frags` DESC LIMIT 1")
local BestPA=result.getDataInt(BestPAl, "player_id")
result.free(BestPAl)
local BestPAm=db.storeQuery("SELECT `name` FROM `players` WHERE `id` = " .. BestPA )

I divided query into two, each of them is written to variable. Atention! this code in lua refers to own functions implemented in supported program.