- Tags: Keyword, MySQL, SQL Server
- Categories: Reference, SQL Keywords, SQL Reference
Quick Reference
The DEFAULT keyword provides a default value for a column that will be added to all new records if no other value is specified.
DEFAULT on CREATE TABLE
The following sets a DEFAULT value for the country column when the Customers table is created.
CREATE TABLE Customers (
country varchar(255) DEFAULT 'USA'
);
DEFAULT on ALTER TABLE
The following sets a DEFAULT value for the country column when the Customers table already exists.
MySQL:
ALTER TABLE Customers
ALTER country SET DEFAULT 'Canada';
SQL Server:
ALTER TABLE Customers
ADD CONSTRAINT df_country
DEFAULT 'Canada' FOR country;
DROP a DEFAULT CONSTRAINT
MySQL:
ALTER TABLE Customers
ALTER country DROP DEFAULT;
SQL Server:
ALTER TABLE Customers
ALTER COLUMN country DROP DEFAULT;
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SQL NOTES:
- Any work being done to modify the structure of a database or delete tables or the the database itself should only be done after making a recent backup
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