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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