SELECT where the column is NULL or a number

Hello

I am trying to use a query that the WHERE clause contains a column that can be NULL or a number. If it contains a number, I want to select the rows that contain the numerical value for this column; Otherwise, the rows that contain NULL for this column, as shown here:

SELECT col_1,
col_2,
etc...
OF CN_BGT_ENTRIES
WHERE grnt_id = p_grnt_id

AND subbgt_nbr = (SELECT MAX (subbgt_nbr) FROM CN_BGT_ENTRIES WHERE grnt_id = p_grnt_id);

in the opposite case

AND subbgt_nbr is null;

My strategy has been to create a cursor, EXTRACT the max value in l_subbgt_max and then use a BOX of the form:

SELECT col_1,
col_2,
etc...
OF CN_BGT_ENTRIES
WHERE grnt_id = p_grnt_id
AND (CASE
WHEN l_subbgt_max IS NULL THEN ' subbgt_nbr IS NULL; "
ELSE ' subbgt_nbr = l_subbgt_max; »
(END);

I tried every syntax since I can think of (for example, CASE NVL(l_subbgt_max,0) = 0) but continues to receive:

PL/SQL: ORA-00920: invalid relational operator
ORA-06550: line 13, column 3:
PL/SQL: SQL statement ignored

I know that I can DECLARE 2 sliders and then use a conditional to run one or the other, but in the interest of the growth and written some thing a little more sophisticated, I was hoping that someone with more experience SQL could tell me how [s] he would do this.

Thanks in advance for your time.

I guess that l_subbgt_nbr is a variable?

In any case, something like this:

SELECT col_1,
col_2,
etc ...
FROM CN_BGT_ENTRIES
WHERE grnt_id = p_grnt_id
AND  ( ( l_subbgt_nbr is null and  subbgt_nbr is null )
          OR ( l_subbgt_nbr is not null and  subbgt_nbr = (SELECT MAX(subbgt_nbr)
                                                        FROM CN_BGT_ENTRIES
                                                        WHERE grnt_id = p_grnt_id)
                )
           );

Cheers, APC

Published by: APC on July 23, 2012 15:46

Tags: Database

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Published by: user455268 on March 1, 2012 19:13

Published by: user455268 on March 1, 2012 19:16
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SELECT where the column is NULL or a number

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