like
select *
from player_t
where player_name like '가_';
select player_name, e_player_name
from player_t
where player_name like '_수%';
not
select player_name, position
from player_t
where not position in ('GK', 'MF', 'FW', 'DF', 'TC');
select player_name, position
from player_t
where not position = any ('GK', 'MF', 'FW', 'DF', 'TC');
select player_name, position
from player_t
where position != all ('GK', 'MF', 'FW', 'DF', 'TC');
select player_name, e_player_name
from player_t
where not e_player_name like '%T%';
문자 함수
select substr(player_name, 1, 1) || '**' || substr(player_name, 2)
from player_t
where length(player_name) not in (1, 3);
날짜 함수
select player_name, birth,
'만 ' || trunc(months_between(sysdate, birth) / 12) || '세 ' ||
trunc(mod(months_between(sysdate, birth), 12)) || '개월'
from player_t;