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2. How to remove not null constraint in sql server using query

   stackoverflow.com/questions/3370159

   Remove column constraint: not null to null. ALTER TABLE test ALTER COLUMN column_01 DROP NOT NULL;

3. SQL NOT NULL Constraint - W3Schools

   www.w3schools.com/sql/sql_notnull.asp

   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.

4. How to delete Not null constraint in SQL? - Stack Overflow

   stackoverflow.com/questions/31281870

   There's a big difference because you can disable the NOT NULL constraint, add null column values, then re-enable the constraint with ENABLE NOVALIDATE and the existing nulls are allowed. You can't do that with drop/re-add.

5. How to Remove a NOT NULL Constraint in SQL Server

   popsql.com/learn-sql/sql-server/how-to-remove-a-not-null-constraint-in-sql-server

   Learn how to remove a NOT NULL constraint in SQL Server for a specific column. Use the "ALTER TABLE" command with "ALTER COLUMN" and redefine the column with or without the "NULL" attribute as per your requirements.

6. plsql - How can I drop a "not null" constraint in Oracle when I...

   stackoverflow.com/questions/2540615

   If you specify "Primary Key" or a check constraint in the column definition without naming it, you'll end up with a system-generated name for the constraint (and the index, for the primary key). In those cases, you'd need to know the name to drop it.

7. What Is a NOT NULL Constraint in SQL? - LearnSQL.com

   learnsql.com/blog/not-null-constraint-sql

   In this article, we will cover the NOT NULL constraint, which is used to avoid having NULL values in a column. Remember, a NULL value in a column represents the absence of a defined value. If for some reason we omit the value at the time of record creation, the field by default is set to NULL , meaning that NULL is the default value for the column.

8. Essential Guide to SQL Server NOT NULL Constraint By Examples

   www.sqlservertutorial.net/sql-server-basics/sql-server-not-null-constraint

   Removing NOT NULL constraint. To remove the NOT NULL constraint from a column, you use the ALTER TABLE ALTER COLUMN statement as follows: ALTER TABLE table_name ALTER COLUMN column_name data_type NULL; Code language: SQL (Structured Query Language) (sql) For example, to remove the NOT NULL constraint from the phone column, you use the following ...

9. SQL Server NOT NULL CONSTRAINT

   www.sqlservertutorial.org/sql-server-not-null

   The basic syntax of enabling the NOT NULL CONSTRAINT using CREATE TABLE and ALTER TABLE statements and removing using ALTER TABLE statement is given below. CREATE TABLE Syntax. CREATE TABLE table_name ( column1 DATATYPE, column2 DATATYPE NOT NULL, column3 DATATYPE NOT NULL, ………………………………); ALTER TABLE Syntax (to enforce constraint)

10. How to Remove a Not Null Constraint in MySQL - PopSQL

    popsql.com/learn-sql/mysql/how-to-remove-a-not-null-constraint-in-mysql

    Discover how to modify MySQL table columns by removing the NOT NULL constraint using the ALTER TABLE command. Learn the step-by-step process to redefine column attributes and ensure your database schema aligns with your data requirements.

11. SQL NOT NULL Constraint (With Examples) - Programiz

    www.programiz.com/sql/not-null

    Remove NOT NULL Constraint. We can also remove the NOT NULL constraint if that is no longer needed. For example, SQL Server. ALTER TABLE Colleges ALTER COLUMN college_id INT; Oracle. ALTER TABLE Colleges MODIFY (college_id NULL);