출처 : http://www.oracleclub.com/article/22424
select *
from (
select MIN( decode( to_char( ym + level - 1, 'd' ), '1', level )) sun
,MIN( decode( to_char( ym + level - 1, 'd' ), '2', level )) mon
,MIN( decode( to_char( ym + level - 1, 'd' ), '3', level )) tue
,MIN( decode( to_char( ym + level - 1, 'd' ), '4', level )) wen
,MIN( decode( to_char( ym + level - 1, 'd' ), '5', level )) thu
,MIN( decode( to_char( ym + level - 1, 'd' ), '6', level )) fri
,MIN( decode( to_char( ym + level - 1, 'd' ), '7', level )) sat
from ( select to_date( '200912', 'YYYYMM') ym from dual)
connect by level <= LAST_DAY (ym) - ym + 1
group by trunc(ym + level, 'iw')
order by sat );
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