SQL

sql missing values

-- Find missing t1 values in t2 (based on 'id' field)
SELECT * FROM t1 WHERE t1.id NOT IN (SELECT id FROM t2);
-- or
SELECT * FROM t1 WHERE NOT exists (
    SELECT NULL FROM t2 WHERE t2.id = t1.id
);
-- or
SELECT t1.* FROM t1 LEFT OUTER JOIN t2 ON t2.id = t1.id WHERE t2.id IS NULL;

Select the number of missing values in column SQL

-- You can check for NULL values using the expression IS NULL:
SELECT COUNT(*)
FROM example_table
WHERE example_column IS NULL;