sql query to check not null 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

SELECT * FROM my_table WHERE my_column IS NOT NULL;

Example 3: how to check if a column is null in sql

SELECT column_name FROM table_name 
WHERE column_name IS NULL;

Example 4: sql from null to not null

ALTER TABLE ime_tabele
ALTER stolpec SET NOT NULL;

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