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When adding a column to a table that has a default value and a constraint of not null Is it better to run as a single statement or to break it into steps while the database is under load ALTER TABLE user ADD country VARCHAR2 (4) DEFAULT 'GB' NOT NULLAug 21, 17 · (1) In very Big Table add column as NOT NULL with 'y' default value (it update in data dictionary with value 'y') (2) query the records we see default value as 'y' (3) Now again alter table change default value for the column added in step 1 'X' (This will again update the data dictionary and override previous value ie 'y' with 'x')To create a virtual or computed by column use either the create table or alter table add column clause This special column computes a value when selected or when referenced in a WHERE clause Consider this simple example SQL> create table PERSON ( cont> (employee_id integer, cont> employee_id_disp computed by Hsqldb Add Column To Hsqldb...