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CREATE TABLE tab AS SELECT 'Jan' AS month, 9991 AS id, 158423 AS transaction_id UNION ALL SELECT 'Jan' AS month, 9991 AS id, 537912 AS transaction_id UNION ALL SELECT 'Jan' AS month, 9988 AS id, 417823 AS transaction_id UNION ALL SELECT 'Jan' AS month, 9981 AS id, 659231 AS transaction_id UNION ALL SELECT 'Jan' AS month, 9980 AS id, 832239 AS transaction_id
5 rows affected
SELECT DISTINCT month, SUM(COUNT(*)) OVER(PARTITION BY month) AS cnt FROM tab GROUP BY month, ID HAVING COUNT(DISTINCT transaction_id) = 1
month
cnt
Jan
3