how to add not null constraint in sql

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Tommaso
07 Apr 2016
1ALTER TABLE table_name MODIFY column_name datatype NOT NULL;
2
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Malo
13 May 2017
1By default, a column can hold NULL values.
2The NOT NULL constraint enforces a column to NOT accept NULL values.
3This 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.
4
5Sql NOT NULL in creating a table
6CREATE TABLE Persons (
7    ID int NOT NULL,
8    LastName varchar(255) NOT NULL,
9    FirstName varchar(255) NOT NULL,
10    Age int
11);
Shea
17 Jun 2020
1ID int(10) NOT NULL;
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