how to concatenate more than two columns in plsql developer? [duplicate]

Answer 1

Concat only takes two arguments. See: http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions026.htm

Use the concatenation operator:

select column1 || column2 || column3 ...

Answer 2

select ([column1]+','+[column2]+','+[column3]) as concatcolumn from table

Try above the query.it may changes on different type of column data type.