How to assign the next value in the sequence directly in a variable?

How to assign the next value in the sequence directly in a variable without using a table TWICE in PL/SQL.

BluShadow wrote:

How about a quick test on 11g, just to see if you directly select a sequence in a variable is significantly better than the mark of DOUBLE.

...

Nope... no obvious difference.

This is because there is none: Oracle's SELECT sequence. NEXTVAL FROM DUAL under the covers. The direct assignment is just a convenient encoding for us, but it does not change the work that accomplishes Oracle.

create sequence s;
alter system flush shared_pool;
declare
l_num number;
begin
l_num := s.nextval;
end;
/
select sql_text from v$sql where parsing_schema_name = user;
SQL_TEXT
Report the number of l_num; begin l_num: = s.nextval; end;
Select sql_text from v$ sql where parsing_schema_name = user
Select double S.NEXTVAL

Tags: Database

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