Oracle concatenate columns together tips

Oracle Database Tips by Donald BurlesonMarch 25, 2015

Question: How to I concatenate two columns together? I want to join two columns together.

Answer: I would use create table as select (CTAS) to concatenate two columns together:

create table
   newtab
as
select
   col1||col2 newcol
from
   oldtab;

rename oldtab to junktab;

rename newtab to oldtab.

You can also create a function-based virtual column, something like this (not tested):

alter table oldtab add newcol as col1||col2;

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