SQL: Filter rows against NULL

SQL Wildcard & Special Operator : Exercise-20 with Solution

Write a SQL statement to find that customer with all information who does not get any grade except NULL.

Sample table: customer

Sample Solution :

SELECT *
FROM customer
WHERE grade IS NULL;

Output of the Query:

customer_id	cust_name	city	grade	salesman_id
3001		Brad Guzan	London		5005

Explanation :

Pictorial presentation :

Query Visualization:

Duration:

Rows:

Cost:

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