Pivoting techniques (Rows to Column conversion) is very possible in Oracle
SQL. There are two methods used popularly for Pivoting in Oracle SQLO( From Oracle
8i) . They are:
1. Using Decode ( or CASE )
2. Using
Sys_connect_by_path
1. Using Decode
This method uses
Decode and group by together.
2. Using Sys_connect_by_path
As Sys_connect_by_path is used along
with hierarchical queries, we need to make any query in that format for doing
the pivot . It returns the path of a column value from root to node, with column
values separated by char for each row returned by CONNECT BY condition.
Though Decode gives more
flexibility, Sys_connect_by_path is recommended in case row values are unknown
or not fixed.
