Concat function is not working - invalid number of arguments

Question

I have a table with two columns(Name, Occupation). I want to output the value in a format something like this.

Jane(A) 
Jenny(D) 
Julia(A)

Answer 1

This happens to be one reason why I prefer replace() over concat():

SELECT REPLACE(REPLACE('{Name} ({Occ})', '{Name}', Name'
                      ), '{Occ}', SUBSTR(Occupation, 1, 1)
              )

You can readily see the format of the string being created and easily change it. Also, REPLACE() converts arguments to the appropriate type (which Oracle does with string concatenation anyway).

Answer 2

You can use just || for concatenating

select c1  ||   c2 ||   c3 || c4   as  col from mytable

Answer 3

SELECT CONCAT(Name,"(",SUBSTR(Occupation,1,1),")") FROM OCCUPATIONS;

First, the double quotes " are used to enclose identifiers. use single quote ' to wrap a string.

Second, CONCAT accepts two params.

You could nest bunch of concats, but it's easier and cleaner to use concatenation operation ||:

SELECT Name || '('  || SUBSTR(Occupation,1,1) || ')' FROM OCCUPATIONS;

Answer 4

you may try this

select CONCAT(CONCAT(FIRST_NAME,' '),LAST_NAME) from employees;

By using this you have to give number of nested CONCAT functions equals to the number of arguments

Results

CONCAT(CONCAT(FIRST_NAME,''),LAST_NAME)

• Neena kochhar
• steven king
• Alexander Hunold