Valores únicos de distintas columnas

[Zuker]

Lo logre hacer de esta forma

Código MySQL:

SELECT DISTINCT pos1 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos2 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos3 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos4 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos5 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos6 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos7 AS 'equipos'
FROM stats_teams
UNION
SELECT DISTINCT pos8 AS 'equipos'
FROM stats_teams
LIMIT 0 , 30