Hi, my use-case is to generate a unique random alpha numeric in specific format as below. Can you please help?
Required Format: ANNNNNNNN (must start with random alpha char followed by 8 random digits)
One way is a to wrap a sequence in calls to dbms_random to generate a letter and numbers. Padding out the sequence values with zeros as needed:
create sequence s;
select dbms_random.string ( 'U', 1 ) ||
lpad ( s.nextval, 7, '0' ) ||
round ( dbms_random.value ( 0, 9 ) ) val
from dual
connect by level <= 10;
VAL
N00000018
Q00000029
Z00000038
D00000048
L00000051
N00000064
F00000072
V00000082
M00000092
X00000103 Note this only guarantees 10 million unique values. Once your sequence hits this value, you could start generating duplicates. I'm not aware of a good way to solve this...