Issue NUMBER and VARCHAR CONCATENATE

I'm trying to concatenate a string and an integer. However, is the number that I'm trying to concatenate a number returned by the rank function, and it is part of a CASE statement. I realize that this seems a bit confusing, so here is an example of pseudo-device of what I'm trying to do:
WITH temp_table AS
(
 SELECT 1 AS col1 FROM DUAL UNION ALL
 SELECT 2 FROM DUAL UNION ALL
 SELECT 3 FROM DUAL UNION ALL
 SELECT 3 FROM DUAL 
)
SELECT CASE WHEN COUNT(*) OVER (PARTITION BY col1) > 1 
            THEN
                  RANK() OVER (ORDER BY col1) || 't'
            ELSE
                  RANK() OVER (ORDER BY col1)
       END AS test
FROM   temp_table;
Desired results set: 
TEST
1
2
3t
3t
When I do the above, I get a ' incompatible data types: expected TANK got the NUMBER "exception. I tried to convert the "RANK() OVER (ORDER BY col1)' to a string via the function TO_CHAR and the CAST function, but none worked. I figure out how to reach my goal by creating a subquery, convert the column test tank and that the addition of the 't' character to it in the external SELECTION; I was wondering if it was possible to do what I asked in a query (without a subquery).

Apart from this is one of the sql statement more sophisticated that I've seen for a long time you can try this 'trick '.

WITH temp_table AS
(
 SELECT 1 AS col1 FROM DUAL UNION ALL
 SELECT 2 FROM DUAL UNION ALL
 SELECT 3 FROM DUAL UNION ALL
 SELECT 3 FROM DUAL
)
SELECT CASE WHEN COUNT(*) OVER (PARTITION BY col1) > 1
            THEN
                  RANK() OVER (ORDER BY col1) || 't'
            ELSE
                  RANK() OVER (ORDER BY col1) || ''
       END AS test
FROM   temp_table;

TEST
1
2
3t
3t

the result of the case statement must be the same type of data in each branch

concerning

Tags: Database

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