How to change a dataype CLOB TO VARCHAR2(sql)

Question

Table: customers

ID      NAME             DATATYPE
NUMBER  VARCHAR2(100)    CLOB

I want to change the DATA column from C

Answer 1

You may try this:

1. Add a new column as varchar2

   alter table my_table add (new_column varchar2(1000));

2. UPDATE CLOB name to varchar2 column;

   update my_table set new_column=dbms_lob.substr(old_column,1000,1);

After testing your data:

3. DROP CLOB column

   alter table my_table drop column old_column

4. Rename varchar2 column to CLOB column name

   alter table my_table rename column new_column to old_column