create column with default value in sql code example

Example 1: add column table sql default value

ALTER TABLE users
ADD visit_number INT DEFAULT 0;

Example 2: alter table add column with default value

ALTER TABLE Protocols
ADD ProtocolTypeID int NOT NULL DEFAULT(1)

Example 3: sql server create table column default value constraint name

CREATE TABLE dbo.doc_exz (
      column_a INT,
      column_b INT CONSTRAINT DF_Doc_Exz_Column_B DEFAULT 50);

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