Cannot change the column in Table

Hello

Well I have a table called T1 where I have some columns with 70 000 lines in this table.
now I need to change a size of datatype of columns of 5.2 to 5.4, with the command below.

SQL > alter table t1 modify column_name1 number (5.4);

When I run this command I get the below error

ORA-01440: column to change must be empty to reduce the precision or scale

So what I did is based on the table in another table t2 and now deleted all t1 lines.
Once again, I have changed now the column modified successfully to (5.4)
But even once when I insert the backup to the top of table t2 in t1 I received this error below.

ORA-01438: value larger than the precision specified for the column


the table t1 column_name1 number (5.2)
changed as column_name1 number (5.4)

now why can't I could insert the values inside by a backup table?

pls help.


Concerning
Stanlee.

As the previous man said, you must change 7.4 like accuracy then try to insert. It's that workout.

Iqbal

Tags: Database

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