sql is null
snippet in sql

Select without null values sql

user6509

SELECT column_names
FROM table_name
WHERE column_name IS NOT NULL;

sql not null

user7892

SELECT column_name FROM table_name 
WHERE column_name IS NOT NULL;

sql is null

user1465

Tests for empty (NULL) values.
Example: Returns users that haven’t given a contact number.
SELECT * FROM users
WHERE contact_number IS NULL;

is null sql

user9003


  SELECT column_names
FROM table_name

  WHERE column_name IS NULL; 

how to check if a column is null in sql

user9398

SELECT column_name FROM table_name 
WHERE column_name IS NULL;

NOT NULL SQL

user487

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
);