sql server default value from another column code example

Example 1: 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);

Example 2: default column value in sql same as other column

ALTER TABLE tablename ADD newcolumn type NOT NULL DEFAULT (0)
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Update tablename SET newcolumn = oldcolumn Where newcolumn = 0
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