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;NOT NULL SQL
By default, a column can hold NULL values.
The NOT NULL constraint enforces a column to NOT accept NULL values.
This enforces a field to always contain a value, which means that you cannot insert a new record, or update a record without adding a value to this field.
Sql NOT NULL in creating a table
CREATE TABLE Persons (
ID int NOT NULL,
LastName varchar(255) NOT NULL,
FirstName varchar(255) NOT NULL,
Age int
);Copyright © 2021 Codeinu
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