Adding a column with a Default value?

Question

I am adding a column to my database table. It is a simple Char column with either a value of 'Y' or 'N'.

Is it possible to default the column to be 'N'? If so, how?

Current Script to add column:

ALTER TABLE PERSON
ADD IS_ACTIVE VARCHAR2(1);

Answer 1

ALTER TABLE PERSON
ADD IS_ACTIVE VARCHAR2(1) DEFAULT 'N'

If you want, you can add a NOT NULL constraint:

ALTER TABLE PERSON
ADD IS_ACTIVE VARCHAR2(1) DEFAULT 'N' NOT NULL

Answer 2

According to the documentation:

ALTER TABLE person ADD is_active VARCHAR2(1) DEFAULT 'N';

Answer 3

you just need to add Default <your default value> to it.

for example:

ALTER TABLE person ADD is_active VARCHAR2(20) DEFAULT 'N';

Answer 4

ALTER TABLE PERSON ADD IS_ACTIVE VARCHAR(1) DEFAULT('N') NOT NULL

Answer 5

MySql version

While creating table

CREATE TABLE tblPERSON ( id INT NOT NULL , IS_ACTIVE CHAR NULL DEFAULT 'N' )

Altering

ALTER TABLE tblperson ADD IS_ACTIVE CHAR NULL DEFAULT 'N' 

Answer 6

ALTER TABLE PERSON ADD IS_ACTIVE CHAR(1 BYTE) DEFAULT 'N';

Answer 7

ALTER TABLE table_name ADD column_name varchar2(1) DEFAULT 'N' not null;