Error number invalid when using case when

I have a table called NATIONAL_RARE_ECOSYSTEMS that contains 1 column called TEST_COLUMN (data type: varchar2):

TEST_COLUMN
rare ecosystem
rare
0
0
(null)
(null)

what I want is a query that will add a column called NRE_SCORE that will give each instance of line a score of 0 if it is null.
If it is 0, then the score should be 0.
If the line contains any text, partition should be 1

I wrote the request:

SELECT
(CASE WHEN test_column is null THEN 0)
WHEN test_column = 0 THEN 0
WHEN test_column > 0, 1
END) AS NRE_SCORE
OF NATIONAL_RARE_ECOSYSTEMS;

I get the error message:

ORA-01722: invalid number
01722 00000 - "invalid number."

I think it is because on the 2nd and 3rd line, trying to perform arithmetic operations on a column which is varchar2 which I know that I can't do.

How can I write a query that says: If the line contains text, then gives the score of 1?

I'm using oracle 11g.

Hello

993451 wrote:
I have a table called NATIONAL_RARE_ECOSYSTEMS that contains 1 column called TEST_COLUMN (data type: varchar2):

TEST_COLUMN
rare ecosystem
rare
0
0
(null)
(null)

what I want is a query that will add a column called NRE_SCORE that will give each instance of line a score of 0 if it is null.
If it is 0, then the score should be 0.
If the line contains any text, partition should be 1

Any text other than '0', you mean. I guess that doesn't matter if this text is all the numbers, like '9876 'or something with no numbers, as 'rare'.

I wrote the request:

SELECT
(CASE WHEN test_column is null THEN 0)
WHEN test_column = 0 THEN 0
WHEN test_column > 0 THEN 1
END) AS NRE_SCORE
OF NATIONAL_RARE_ECOSYSTEMS;

I get the error message:

ORA-01722: invalid number
01722 00000 - "invalid number."

I think it is because on the 2nd and 3rd line, trying to perform arithmetic operations on a column which is varchar2 which I know that I can't do.

You are not actually doing arithmetic, but you compare your VARCHAR2 column, so he tries to convert the string to a NUMBER, and that's why you get the error ORA-01722.
>

How can I write a query that says: If the line contains text, then gives the score of 1?

I'm using oracle 11g.

Here's one way:

SELECT       CASE
           WHEN  NVL (test_column, '0') = '0'
           THEN  0
           ELSE  1
       END          AS nre_score
,       ...          -- you must want other columns, too
FROM       national_rare_ecosystems
;

Since you are not really care on the numerical value, do not use numbers anywhere; stick with VARCHAR2s, for example '0'.

I hope that answers your question.
If not, post a small example data (CREATE TABLE and only relevant columns, INSERT statements) and also publish outcomes from these data.
Point where the above query was to get erroneous results, and explain, using specific examples, how you get these results of the sample data in these palces.
See the FAQ forum {message identifier: = 9360002}

Tags: Database

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