sql not equal with null code example
Example 1: sql not equal
<> Not equal. Note: In some versions of SQL this operator may be written as !=
Example sql query:
1) Selecting groceries where price is not 20
SELECT * FROM Grocery WHERE Price <> 20;
Example 2: 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
);
Example 3: not equal in sql
row <> value