Oracle Modify Column Data Type Guide

To change the data type of a table column, you can use the ALTER TABLE statement. Here is an example of modifying a table column data type:

-- 修改表字段类型为VARCHAR2(50)
ALTER TABLE 表名
MODIFY 列名 VARCHAR2(50);

To change the field type to numeric, you can use a similar syntax:

-- 修改表字段类型为NUMBER
ALTER TABLE 表名
MODIFY 列名 NUMBER(10,2);

Before executing the ALTER TABLE statement, make sure to back up the data to prevent any unexpected loss.