Re: Selecting newly added column returns empty but only when selecting with other columns in table - Mailing list pgsql-general
Hi,
Thanks for the reply. The limit is just to simplify results for the examples. The same behavior occurs when each of the three queries are not limited. Whenever I try to filter by the original columns and select the new column the resultant values for the new column are empty. Conversely, whenever I select the new column along with original columns without any filtering the resultant values for the original columns return empty. It's as if the added column is disconnected to the table in some way causing problems with queries that combine original columns and the new one.
I created and filled in the new column externally using psycopg2 in Python so I'm not sure if that could be the source of the problem...
On Thu, Nov 26, 2015 at 5:39 PM, Melvin Davidson <melvin6925@gmail.com> wrote:
Is it possible you have more than one row where state = 'CA'? Putting a LIMIT 1 would then restrict to only 1 row.Have you tried with no limit? IE:SELECT new_col FROM data;--On Thu, Nov 26, 2015 at 7:13 PM, mrtruji <mrtruji@gmail.com> wrote:Just added a new bytea type column to an existing psql table and populated the column entirely with row data. Running into some strange query results:
When I select the newly added column by itself I get all the data as expected:
SELECT new_col FROM data LIMIT 1; Result: \x8481e7dec3650040b....When I try to filter with 'where' on another column in the table, I get the values from the other columns as expected but empty from my new_column:
SELECT id, state, new_col FROM data WHERE state='CA' limit 1; Result: 123456_1; CA; EMPTY ROWThe reverse is also true. If I select my new column in combination with other columns with no 'where' I get the correct value from my new column but empty for the other columns:
SELECT id, state, new_col FROM data limit 1; Result: EMPTY ROW; EMPTY ROW; \x8481e7dec3650040b....Thanks to anyone with advice!
Melvin Davidson
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