ERROR: to_timestamp(): bad value -26 for day of the month.
Solution:- Check
the format defined.
Ex:- Select
to_timestamp('2002-09-26^15:00:00','YYYY-MMDD^HH24:MI:SS')
Correction Select to_timestamp('2002-09-26^15:00:00','YYYY-MM-DD^HH24:MI:SS')
If you see the above function
usage, the timestamp passing and defined don’t match (highlighted in different
color)
ERROR:-
When using the to_timestamp
conversion function, which takes an input and a template string, the number of
spaces in both strings must match. The following example uses the character“^”
to represent a space.
In the previous example, the
conversion function works as expected. In the following example, there is an
extra space in the template string:
To_timestamp('2002-09-26^15:00:00','YYYY-MM-DD^^HH24:MI:SS').
In this case, the extra space before the “HH”
causes the function to ignore the “1” in the “15” string, thus returning an
incorrect result.
Problem:- SQL operations on a float column can yield inconsistent results if not used properly.
Problem:- SQL operations on a float column can yield inconsistent results if not used properly.
Soulution:- The hashing of floating point data
can result in certain SQL operations that return inconsistent results if not
used correctly. Inconsistent results can occur if floating point columns are
used as the distribution key, as a join column, or in group by, order by, and
distinct select operations.
Do not use floating point columns
for such operations.
Note: A floating point column is a column
defined in the CREATE statement with a data type of FLOAT, DOUBLE, FLOAT4, or
FLOAT8.
Information:- By default Neetzza system treats time values without timezones as GMT times. An example follows:
create table TIME1(TM timetz); (a time with timezone column)
insert into TIME1 values (‘1:00’); (a time value without a timezone)
select * from TIME1; (shows the value that has a timezone offset of (GMT)).
Information:-
Certain operations do not work on synonyms. For example, you cannot generate statistics on synonyms, nor can you truncate a synonym.
Performance :- For system efficiency, avoid the use of joins with external tables.
If one try to perform they may face the below error
Information:- By default Neetzza system treats time values without timezones as GMT times. An example follows:
create table TIME1(TM timetz); (a time with timezone column)
insert into TIME1 values (‘1:00’); (a time value without a timezone)
select * from TIME1; (shows the value that has a timezone offset of (GMT)).
Information:-
Certain operations do not work on synonyms. For example, you cannot generate statistics on synonyms, nor can you truncate a synonym.
Performance :- For system efficiency, avoid the use of joins with external tables.
If one try to perform they may face the below error
Error: 1000000161: query does not
support complex External Table scan
Information :- Update in Netezza with self join.
UPDATE product_dim B
SET B.prod_nm = NAME
FROM (SELECT product_id,
NAME
FROM product_dim
LEFT OUTER JOIN product_dis
ON product_id = productid)A
WHERE A.product_id = B.product_id
Information :- Update in Netezza with self join.
UPDATE product_dim B
SET B.prod_nm = NAME
FROM (SELECT product_id,
NAME
FROM product_dim
LEFT OUTER JOIN product_dis
ON product_id = productid)A
WHERE A.product_id = B.product_id
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