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Solved
Creating alphanumeric sequence generator
Posted on 2004-08-16
How to create sequence generator for generating following sequence:
A0001, A0002,....B0001,B0002,....
A0001, A0002,....B0001,B0002,....
[X]
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11 Comments
Use this PL/SQL script for generating the sequence..
==========================
declare
v_data varchar2(5);
v_data_1 varchar2(5);
begin
for rec_alpha in 65..90
loop
for rec_num in 0..9999
loop
v_data := chr(rec_alpha);
select decode(length(rec_num),1,'
into v_data_1
from dual;
v_data := v_data||v_data_1;
dbms_output.put_line(v_dat
end loop;
end loop;
end;
/
==========================
==========================
declare
v_data varchar2(5);
v_data_1 varchar2(5);
begin
for rec_alpha in 65..90
loop
for rec_num in 0..9999
loop
v_data := chr(rec_alpha);
select decode(length(rec_num),1,'
into v_data_1
from dual;
v_data := v_data||v_data_1;
dbms_output.put_line(v_dat
end loop;
end loop;
end;
/
==========================
friend
i want to use only
"create sequence ...."
for generating sequence, not procedure, function or other stuff
Thanks
i want to use only
"create sequence ...."
for generating sequence, not procedure, function or other stuff
Thanks
OK...in any case Sequence cannot generate an alphanumeric sequence.
For what purpose are you looking for?
You can import same logic into a trigger etc if your purpose is to generate an ID or something...
For what purpose are you looking for?
You can import same logic into a trigger etc if your purpose is to generate an ID or something...
Its too easy...here is a test case (@@ catchmeifuwant i beg to differ here ):
SQL> create sequence my_seq;
Sequence created.
Elapsed: 00:00:00.16
SQL> ed
Wrote file afiedt.buf
1 select my_seq.nextval,
2 chr( ascii('A')+mod(trunc(my_se
3 to_char(mod(my_seq.nextval
4* from dual
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
1
A00001
Elapsed: 00:00:00.16
SQL> ed
Wrote file afiedt.buf
1 select my_seq.nextval,
2 chr( ascii('A')+mod(trunc(my_se
3 to_char(mod(my_seq.nextval
4* from dual
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
2
A00002
Elapsed: 00:00:00.28
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
3
A00003
Elapsed: 00:00:00.28
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
4
A00004
Elapsed: 00:00:00.44
SQL> spo off
SQL> create sequence my_seq;
Sequence created.
Elapsed: 00:00:00.16
SQL> ed
Wrote file afiedt.buf
1 select my_seq.nextval,
2 chr( ascii('A')+mod(trunc(my_se
3 to_char(mod(my_seq.nextval
4* from dual
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
1
A00001
Elapsed: 00:00:00.16
SQL> ed
Wrote file afiedt.buf
1 select my_seq.nextval,
2 chr( ascii('A')+mod(trunc(my_se
3 to_char(mod(my_seq.nextval
4* from dual
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
2
A00002
Elapsed: 00:00:00.28
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
3
A00003
Elapsed: 00:00:00.28
SQL> /
NEXTVAL
==========
CHR(ASCII('A')+MOD(TRUNC(M
==========================
4
A00004
Elapsed: 00:00:00.44
SQL> spo off
No problem Riazpk...
well at the end of the day, there's something applied onto the sequence to get the desired results(different logic ofcourse).
What I was saying was "A sequence cannot generate AlphaNumeric series directly".
Look at his comment :
--------------
friend
i want to use only
"create sequence ...."
for generating sequence, not procedure, function or other stuff
--------
which is NOT possible.
Anyway thanks for the piece of code...pretty nice job there :-) Cheers !
well at the end of the day, there's something applied onto the sequence to get the desired results(different logic ofcourse).
What I was saying was "A sequence cannot generate AlphaNumeric series directly".
Look at his comment :
--------------
friend
i want to use only
"create sequence ...."
for generating sequence, not procedure, function or other stuff
--------
which is NOT possible.
Anyway thanks for the piece of code...pretty nice job there :-) Cheers !
Active 4 days ago
Do you need to generate numbers A0001 - A9999, then B0001 - B9999, etc. through Z9999? What should happen after you generate 26,000 values?
I agree with the others, you cannot do this simply with a sequence. What you can do is create a sequence that will generate values from 1 - 9999, then start over with 1 again, like this:
create sequence my_seq maxvalue 9999 cycle;
But you will have to write a mechanism to keep track of which letter value to concatenate with the value from the sequence. You may be able to use a table that you create named: "alphabet" and populate with 26 records: A - Z. You may need a flag and date column in this table also, to keep track of which alpha value to use, and when it is time to get the next one. A PL\SQL function can do this for you.
I agree with the others, you cannot do this simply with a sequence. What you can do is create a sequence that will generate values from 1 - 9999, then start over with 1 again, like this:
create sequence my_seq maxvalue 9999 cycle;
But you will have to write a mechanism to keep track of which letter value to concatenate with the value from the sequence. You may be able to use a table that you create named: "alphabet" and populate with 26 records: A - Z. You may need a flag and date column in this table also, to keep track of which alpha value to use, and when it is time to get the next one. A PL\SQL function can do this for you.
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