tsql alter column not null code example

Example 1: Change A filed to not null

ALTER TABLE
  clients
ALTER COLUMN
  phone
    NVARCHAR(20) NOT NULL;

Example 2: set column to not null mysql

ALTER TABLE Person MODIFY P_Id INT(11) NOT NULL;

Example 3: alter column to not null with default value sql server

ALTER TABLE SomeTable
        ADD SomeCol Bit NULL --Or NOT NULL.
 CONSTRAINT D_SomeTable_SomeCol --When Omitted a Default-Constraint Name is autogenerated.
    DEFAULT (0)--Optional Default-Constraint.
WITH VALUES --Add if Column is Nullable and you want the Default Value for Existing Records.

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