What is the string concatenation operator in Oracle?

sql oracle plsql string-concatenation
AJ. picture AJ. · Nov 10, 2008 · Viewed 303.7k times · Source

What is the string concatenation operator in Oracle SQL?

Are there any "interesting" features I should be careful of?

(This seems obvious, but I couldn't find a previous question asking it).

Answer

Tony Andrews picture Tony Andrews · Nov 10, 2008

It is ||, for example:

select 'Mr ' || ename from emp;

The only "interesting" feature I can think of is that 'x' || null returns 'x', not null as you might perhaps expect.

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