Generation of the sequence.

I noticed that the sequence is generated on all cases when we use it in a select statement.

For example I have a DECODE in the select statement and I use two sequences one if the statement is TRUE and the other when his SCYTHE. But the sequence are generated on both the two. I know this behavior but I just want to know why it happens like that.

Here is a small example.
SQL> create table t
  2  as
  3  select level no
  4    from dual
  5  connect by level <= 10
  6  /

Table created.

SQL> create sequence s1
  2  /

Sequence created.

SQL> create sequence s2
  2  /

Sequence created.

SQL> select no, decode(mod(no,2),0,'even-'||to_char(s1.nextval),'odd -'||to_char(s2.nextval)) seqval
  2    from t
  3  /

        NO SEQVAL
---------- ---------------------------------------------
         1 odd -1
         2 even-2
         3 odd -3
         4 even-4
         5 odd -5
         6 even-6
         7 odd -7
         8 even-8
         9 odd -9
        10 even-10

10 rows selected.

SQL> select s1.currval from dual
  2  /

   CURRVAL
----------
        10

SQL> select s2.currval from dual
  2  /

   CURRVAL
----------
        10
Thank you
Knani.

A sequence is prety different, it is not a function.
For a given sequence, Oracle only launch a sequence to each row value.

Please, ask in this thread:
http://asktom.Oracle.com/pls/asktom/f?p=100:11:0:P11_QUESTION_ID:8491662046178

Nicolas.

Tags: Database

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