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Developer-C 11.1
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CREATE TABLE transactions ( valuation_id INT, `date` DATE, stock_A DECIMAL(18,2), stock_B DECIMAL(18,2), stock_C DECIMAL(18,2) ); INSERT INTO transactions VALUES (1, '2020-01-22 07:33:00', 17.6, 22.4, 10.5), (2, '2020-01-23 07:33:00', 18.2, 26.1, 10.2), (3, '2020-01-24 07:33:00', 15.5, 26.8, 10.8), (4, '2020-01-25 07:33:00', 12.5, 28.2, NULL), (5, '2020-01-26 07:33:00', 11.2, NULL, NULL), (6, '2020-01-27 07:33:00', NULL, NULL, NULL);
SELECT MAX(CASE WHEN stock = 'A' THEN stock_A ELSE 0.0 END) AS stock_A, MAX(CASE WHEN stock = 'B' THEN stock_B ELSE 0.0 END) AS stock_B, MAX(CASE WHEN stock = 'C' THEN stock_C ELSE 0.0 END) AS stock_C FROM transactions t INNER JOIN ( SELECT MAX(valuation_id) AS max_valuation_id, 'A' AS stock FROM transactions WHERE stock_A IS NOT NULL UNION ALL SELECT MAX(valuation_id), 'B' FROM transactions WHERE stock_B IS NOT NULL UNION ALL SELECT MAX(valuation_id), 'C' FROM transactions WHERE stock_C IS NOT NULL ) mt ON mt.max_valuation_id = t.valuation_id
stock_A
stock_B
stock_C
11.20
28.20
10.80