How to retreive week days from bit mask value

Question

Hi!
I have a column 'DOW' that store days of the week using bit mask value. Here is how it works:
SUN = 1
MON = 2
TUE = 4
WED = 8
THU = 16
FRI = 32
SAT = 64
All days of week is 127 which is cumulative of all the above. If user selects MON+FRI, then value would be 34.
I need to retrieve data from this column showing the actual day names, separated by a comma. For example, Monday, Friday
Is it possible in Oracle 10g to do this via SQL, if so how?
Any help is deeply appreciated..
Thanks,
Arti

Answer 1

Did you try that beautiful Query, Provided by Blushadow..?
SQL> select c1,rtrim(DECODE(bitand(c1, 1),1,'Sun,',NULL)||
  2            DECODE(bitand(c1, 2),2,'Mon,',NULL)||
  3            DECODE(bitand(c1, 4),4,'Tue,',NULL)||
  4            DECODE(bitand(c1, 8),8,'Wed,',NULL)||
  5            DECODE(bitand(c1, 16),16,'Thu,',NULL)||
  6            DECODE(bitand(c1, 32),32,'Fri,',NULL)||
  7            DECODE(bitand(c1, 64),64,'Sat,',NULL),',') days
  8  from test;
        C1 DAYS
         1 Sun
         2 Mon
        16 Thu
         9 Sun,Wed
       127 Sun,Mon,Tue,Wed,Thu,Fri,Sat
        34 Mon,Fri
6 rows selected.