I am using Oracle SQL Developer 4.0.0.13.
Query :
UPDATE employes
SET emptime = systimestamp
WHERE emp_id = 123
AND emp_device = :abc;
Field Definition : emp_device char(20 byte)
Value is : 99998000000008880999 (This value is present in the table)
When I run the above query in SQL developer it asks me to give the value for the bind variable, which I paste in the text box and it returns 0 rows updated.
But when I remove the bind variable in the update query and specify the actual value, it updates the column value. Below is the query.
Query:
UPDATE employes
SET emptime = systimestamp
WHERE emp_id = 123
AND emp_device = 99998000000008880999 ;
---(works)
Also, when I add some trailing spaces in the bind variable text box and trim the emp_device column, it updates the column. Below is the query.
Query :
UPDATE employes
SET emptime = systimestamp
WHERE emp_id = 123
AND emp_device = trim(:abc);
-- (works --- :abc value is '99998000000008880999 ')
I do not know what is wrong with it. Can someone please take a look and suggest a solution.
You are using CHAR type for your emp_device datatype. Note that CHAR type always blank pads the resulting string out to a fixed width.read this.
You should use VARCHAR2 as datatype if you are expecting a string or just NUMBER as your example consists purely of numeric values.
in dialog box enter your parameter as '99998000000008880999' use apostrophe chars.
Related
From a query I want to replace the null values of the "cod_account" field, the condition to fill this field is that it must take the previous value only if it satisfies that the previous records of other fields (cod_agen, cod_sub, no_prod) are equal.
Currently it is like this:
enter image description here
what is desired is
enter image description here
thanks for your advice. i solve it
use with to separate queries.
select
case when cod_account is null and class ='Primary'
then null
when cod_account is null and class='Secundary'
then (select cod_account from principals P--principals is table create in a "with"
where fa.cod_agen=P.cod_agen
and fa.cod_sub=P.cod_sub
and fa.no_prod=P.no_prod
and p.class='secundary'
)
...
from signs fa
Like the title says, if a create a table in my DB :
CREATE TABLE TEST
(
FIELD CHAR(20 CHAR) NULL
)
NOLOGGING
NOCOMPRESS
NOCACHE;
Insert this :
Insert into TEST
(FIELD)
Values
('TEST -here are blank spaces- ');
COMMIT;
Then i run the following statement :
UPDATE TEST SET FIELD = TRIM(FIELD);
COMMIT;
but the field still has blank spaces, notice that if I change the data type to varchar2, it works ... does anyone know why?
Thanks!
char is a fixed width data type. A char(20) will always and forever have a length of 20. If you try to insert a shorter string, it will be padded with spaces to the fixed width length of the field. So
UPDATE TEST SET FIELD = TRIM(FIELD);
removes the spaces due to the trim function, then adds them back because the string that gets written has to be exactly 20 bytes long.
Practically, there is almost never a case to use char. You're almost always better off with a varchar2. varchar2 is a variable length data type so there is no need for the database to append the spaces to the end.
I have a create statement like
CREATE TABLE temp_tbl (EmpId String,Salary int);
I would like to insert an employee id and a blank value into table.
So What I have done is
insert overwrite table temp_tbl select '013' as EmpId,'' as Salary from tbl;
hive> select * from temp_tbl;
OK
013 NULL
But expected result is
hive> select * from temp_tbl;
OK
013 NULL ---> Blank instead of NULL
Also tried with "". Still I get it as NULL instead of blank
3.Tried to create table with serialization property
CREATE TABLE temp_tbl (EmpId String,Salary int) TBLPROPERTIES ('serialization.null.format' = '');
That too didn't change NULL value to blank.
What can be the workaround for the same.
Use Case while selecting the data.
Select
(CASE
WHEN columnName is null THEN ''
ELSE columnName
END) as 'Result' from temp_tbl;
All types except strings/varchar/char and some complex types like array, in Hive cannot be blank, only NULL is possible. Empty string '' is quite normal value of type String. You can produce empty array() as well (Array with zero size).
As a workaround, you can use some predefined values which are not normally in your data to represent some special numeric values, like -99999. Alternatively you can store your numeric values in a String column, in such case you will be able to have empty values in it. But it's not possible to assign (cast) empty strings to numeric types, because such empty value is not allowed.
If you try to assign empty string to numeric column or cast to numeric type, the result will be the same as if you are converting non-numeric string to numeric - NULL (in Hive if not possible to cast, it returns NULL) or get java.lang.NumberFormatException in Java.
Knowing that datatype Int can be either NULL or integer , I'd think of how to work around the problem.
I have the impression that 0 can do the job. Why can it not?
If 1 is not ideal, why not create a new temp_employees_with_no_salary table?
If 2 is not ideal, can you afford to change the datatype of temp_tbl.Salary from Int to String, then use CAST(Salary AS INT) to work with it?
I have a column with REAL data type, and I'm trying to write a statement to change the default value to 4. However, when I use the select * statement to double check, the column is still empty.
ALTER TABLE recipes
MODIFY NumberOfServings DEFAULT '4';
The DEFAULT value is used at INSERT time. It gives a default value to be inserted when you do not provide a value for the column in the INSERT statement.
You may want to update the table, so that all NULL values are replaced by a given value:
UPDATE recipes SET NumberOfServings=4 WHERE NumberOfServings IS NULL;
You can also specify a value to use when the column is NULL at QUERY time.
This can be done by using the NVL function:
SELECT NVL(NumberOfServings,4) FROM recipes;
http://docs.oracle.com/cd/B19306_01/server.102/b14200/functions105.htm
The default value applies only when you insert new records into the table. It does not update any existing values in the table. Why do you enclose a numeric value in quotes?
I want to remove a piece of a string from a particular table's column. The string I wish to remove is the &expires and everything after it but leave everything before the &expires the same. Is there a way to accomplish with the update statement or is a stored procedure needed?
Table column value is:
Starting Value: DAABq3J65GvwBABbWdkFOnpCj2mEA1lMonZBZADcTYJR6QuLPUlfZBtMyoEl4x2JXQ49cOzjZAStQxWNOgrurtnMNIw04bmOcQ4SsrjuPKH4AZBBBAf8ZBjWhs8BM52aC0OpnPGzjm6V2x50qk6wboT&expires=5183999
Desired Ending Value:
DAABq3J65GvwBABbWdkFOnpCj2mEA1lMonZBZADcTYJR6QuLPUlfZBtMyoEl4x2JXQ49cOzjZAStQxWNOgrurtnMNIw04bmOcQ4SsrjuPKH4AZBBBAf8ZBjWhs8BM52aC0OpnPGzjm6V2x50qk6wboT
update table set column = regexp_replace(column, '&'||'expires=.*$')