Change the number to varchar DataType
Hello
I need to change the data type for a column (from the number on the varchar type), it is an existing table so data are there.
I'm runnning modify the command to do it, but he asked me to do all null values before treatment.
Is it possible to do without any null values.
In my view, a solution is
(1) to get the data copied to another table, make the NULL column and change... load the data back at the table
It is the only option?
Hello
First of all, make sure that you really want to lose the NUMBER column. Why you change the column? "" For example, if the column is temperature, and you change it so that you can enter values like ' 68 F ' or ' 20 C ', then perhaps you should allow the temperature of the column as a NUMBER and add a new column, temperature_scale VARCHAR2 (1). (Better yet, convert all temperatures to a comments system, possibly with a trigger or a virtual column and save the original measurment, like ' 68 F"in a separate column, if you really need to know how it was entered.)
Because you really need to change to a VARCHAR2 column, then one of the ways is
(1) adds a new column VARCHAR2
(2) fill in this column of the existing NUMBER column
(3) add a NOT NULL constraint in the new column (if necessary)
(4) delete the original column NUMBER
(5) change the name of the new column to the original column was (if desired)
If you deposit the entire table, then you lose all its indexes, triggers and subsidies. If you come to add and remove columns, you do not lose these things.
Tags: Database
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