Transform data from columns to rows on plsql oracle -


i have table 2 columns each month,

table1:

_____________________________________________________________________ |item  |  jan_p    |   jan_r   |   feb_p    |   feb_r   |   commpany|            |______|___________|___________|____________|___________|____________ |1294  |  1234232  |  2323322  |   1242122  |   532323  |   e987    | |______|___________|___________|____________|___________|___________|

i need transfer data new, more normalised table this:

table2:

________________________________________________ | item  | month | cost_p  |  cost_r |  company | |_______|_______|_________|_________|__________| | 1294  |   1   |1234232  |  2323322|    e987  | | 1295  |   2   |1242122  |  532323 |    e987  | |_______|_______|_________|_________|__________|

see image https://ibb.co/cdm91q

i coded loop iterating on first table nested loop insert row each month this: 

for reg in (select * table1) loop     x in 1..12 loop         case x            when 1               insert table2(..., mes , ...) values(... , x, ...)            when 2               insert table2(..., mes , ...) values(... , x, ...)

this working wanted know if there way achieve same outcome.

"i wanted know if there way achieve "

yes there is. ideal use case insert syntax.

insert     table2 (item, month, cost_p, cost_r, commpany )         values (item, 1, jan_p, jan_r, commpany)     table2 (item, month, cost_p, cost_r, commpany )         values (item, 2, feb_p, feb_r, commpany)     table2 (item, month, cost_p, cost_r, commpany )         values (item, 3, mar_p, mar_r, commpany)     table2 (item, month, cost_p, cost_r, commpany )         values (item, 4, apr_p, apr_r, commpany)     table2 (item, month, cost_p, cost_r, commpany )         values (item, 5, may_p, may_r, commpany)     table2 (item, month, cost_p, cost_r, commpany )         values (item, 6, jun_p, jun_r, commpany)     .... select * table1 /

multi-table inserts allow neat things still using set operations. find out more.


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