Record not found in some SQL
----------------------------
Key: DERBY-4032
URL: https://issues.apache.org/jira/browse/DERBY-4032
Project: Derby
Issue Type: Bug
Components: SQL
Affects Versions: 10.3.2.1
Environment: Windows XP
Reporter: Chip Hartney
Per discussion at
http://www.nabble.com/Record-not-found-in-some-SQL---Bug--td21700110.html...
I have a "Product" table with a "Num" column that contains a record that is
only accessible by some SQL and not others. I have tested this by JDBC access
from my Java app as well was from IJ directly.
ij> select "Num", length("Num") as "Len" from app."Product" where "Num" like
'HG1549%';
Num |Len
----------------------------
HG15490 |7
HG15493 |7
HG15497 |7 <== Found as expected
HG15499 |7
4 rows selected
ij> select "Num" from app."Product" where "Num" = 'HG15490';
Num
----------------
HG15490 <== Found as expected
1 row selected
ij> select "Num" from app."Product" where "Num" = 'HG15493';
Num
----------------
HG15493 <== Found as expected
1 row selected
ij> select "Num" from app."Product" where "Num" = 'HG15499';
Num
----------------
HG15499 <== Found as expected
1 row selected
ij> select "Num" from app."Product" where "Num" = 'HG15497';
Num
----------------
0 rows selected <== Not found!!!
What could possibly hide the 'HG15497' record from the last SELECT?
And it's not just a matter of equality versus inequality...as the following SQL
does return the record:
SELECT I."STYLE" FROM TEMP."ZJVINV2" AS I INNER JOIN APP."Product" AS P ON
I."STYLE" = P."Num" WHERE I."STYLE" = 'HG15497';
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