想要在Oracle number数据类型列中将数据插入为“ 001”而不是“ 1”

Question

Want to insert data in oracle number data type column as '001' instead of '1'.

Here is my code:

create table TEMP2 (id number);

INSERT INTO TEMP2 VALUES(001);

When executing:

SELECT * FROM TEMP2;

The output appears as:

ID
1

I want to store number as '001' instead of '1'.

Answer 1

You shouldn't store information that is only used for display purposes. If that is a number, then by all means store it as a number.

You can always format the output when displaying the values:

SELECT to_char(id, 'FM000')
FROM TEMP2;

If you don't want to do that each time you run a select, create a view:

create view formatted_temp
as
SELECT to_char(id, 'FM000')
FROM TEMP2;

Or create a computed column that does that for you:

alter table temp2 
    add formatted_id generated always as (to_char(id, 'FM000'));

Answer 2

You can change the column to VARCHAR2. Wether this is a good solution depends on your needs