--create sample/test data DROP TABLE commissions CREATE TABLE commissions ( tier TINYINT, flag TINYINT, lowValue DECIMAL(12, 2), highValue DECIMAL(12, 2), pct DECIMAL(3, 2) ) INSERT INTO commissions VALUES(0, 0, 0, 2147483647, 0.50) --default commission INSERT INTO commissions VALUES(1, 1, 0, 100000, 0.50) INSERT INTO commissions VALUES(2, 1, 100000.01, 250000, 0.55) INSERT INTO commissions VALUES(3, 1, 250000.01, 2147483647, 0.60) DROP TABLE revenues CREATE TABLE revenues ( empNum INT, gross DECIMAL(12, 2), commissionFlag TINYINT ) INSERT INTO revenues VALUES(1111111, 300500, 1) INSERT INTO revenues VALUES(2222222, 300500, 0) SELECT rev.empNum, rev.gross, SUM(CASE WHEN rev.gross > com.highValue THEN com.highValue - com.lowValue + CASE WHEN com.lowValue <> 0 THEN .01 ELSE 0 END ELSE rev.gross - com.lowValue + CASE WHEN com.lowValue <> 0 THEN .01 ELSE 0 END END * com.pct) AS [commission] FROM revenues rev INNER JOIN commissions com ON rev.commissionFlag = com.flag AND rev.gross >= com.lowValue GROUP BY rev.empNum, rev.gross
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