sql if not null else code example

Example 1: find value if not null in sql

SELECT FIRST_NAME , MANAGER_ID 
FROM EMPLOYEES 
WHERE MANAGER_ID IS NOT NULL ;

Example 2: sql is not null

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

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