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Message Posted: Tue, 15 Sep 2009 @ 12:56:30 GMT
I am not able to understand some INTEGER to VARCHAR data conversion behaviour of Teradata 12.
Could you please help me understand.
Here is my experiment and its result.
I created a table with an Integer column
create table my_tab (cl1 integer);
Then I inserted three values into the table:
insert into my_tab values(1); insert into my_tab values(14444); insert into my_tab values(144);
When I run select query on this table I get three rows as expected.
Now I create another table with a varchar column:
create table my_tab_ch (cl1 varchar(10));
Now I insert values in this table from previous table as follows:
insert into my_tabch sel * from my_tab;
Strangely when I sel from this table my_tabch. I get three rows as expected but the one row with value 1 is missing instead of 1 value is blank. This is not null. Why so?
Then I insert a value in varchar column as follows (note the integer value):
insert into my_tabch values(13333);
And now I insert a character value as follows (note the quotes):
insert into my_tabch values('13333');
When I run the length function on this column, I again see the strange result. The length of the value inserted as integer comes out to be 6 whereas value inserted as string is 5 in length. All other values inserted via Insert..select statement have 10 length, the size of column.
My questions are:
1. if Integer value is having only 5 digits then should it not be a 5 char string in VARCHAR column? If not what govern this behaviour?
2. Why INTEGER value 1 is not inserted in VARCHAR column and instead a space of 0 length was inserted.
3. why same value 13333 inserted as INTEGER and string inserted differently. Again what govern this behaviour?
thanks in advance...
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