extrar cantidad de registros diferentes

[Libras]

Mi falla sorry:

Código SQL:

SELECT  completo FROM(
SELECT SUBSTRING(correo,1,INSTR(correo,'.')+1) AS completo FROM(
SELECT SUBSTRING(email, INSTR(email,'@')+-, lenght(email)) AS correo FROM tabla
) AS t1 
) AS t2 WHERE completo='outlook' LIMIT 2;
UNION ALL
SELECT  completo FROM(
SELECT SUBSTRING(correo,1,INSTR(correo,'.')+1) AS completo FROM(
SELECT SUBSTRING(email, INSTR(email,'@')+-, lenght(email)) AS correo FROM tabla
) AS t1 
) AS t2 WHERE completo<>'outlook' LIMIT 1;
 

Pruebalo de nuevo, el error era que en un union las columnas en los 2 queries deben de ser las mismas