NULL value in the print result

I run a SELECT statement on the form below:

SELECT col1 |' | ' || col2 |' | ' || COL3

TABLE;

It gives me the following outprint, which is what I need

col1 | col2. col3

VARCHAR2. number | VARCHAR2

The problem is when col2 returns a NULL value, then I get this:

VARCHAR2. VARCHAR2

When what I want is this:

VARCHAR2. (null) | VARCHAR2

Is it possible to get my results of the query to print the value NULL (null)?

I tried the function NVL NVL (col2, 'null'), but it won't work because there is a mismatch on data types. I can get the NULL value, printed by concatenating don't not columns and save results to csv, but that does not give me the formatting that I want.

You can convert the character number column, and then look for the NVL.

See below:

with data as
(
  select 'col1' col1, 1 col2, 'col3' col3 from dual union all
  select 'col1' col1, null col2, 'col3' col3 from dual
)
select col1 || '|' || nvl(to_char(col2), 'null') || '|' || col3
  from data;

COL1||'|'||NVL(TO_CHAR(COL2),'NULL')||'|'||COL3
--------------------------------------------------
col1|1|col3
col1|null|col3

Tags: Database

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