Change A filed to not null
ALTER TABLE
  clients
ALTER COLUMN
  phone
    NVARCHAR(20) NOT NULL;Change A filed to not null
ALTER TABLE
  clients
ALTER COLUMN
  phone
    NVARCHAR(20) NOT NULL;sql not null
SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;change sql column from null to not null
ALTER TABLE [TABLE_NAME] CHANGE [COLUMN_NAME] [COLUMN_NAME] [COLUMN_TYPE] NOT NULL DEFAULT [DEFAULT];Copyright © 2021 Codeinu
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