Nettet17. nov. 2015 · DELIMITER $$ CREATE TRIGGER ExampleAutoIncrement BEFORE INSERT ON ExampleTable FOR EACH ROW BEGIN SET NEW.KeyPartB = ( SELECT IFNULL (MAX (KeyPartB), 0) + 1 FROM ExampleTable WHERE KeyPartA = NEW.KeyPartA ); END $$ DELIMITER ; Now inserts work correctly, generating auto … Nettet13. apr. 2024 · 1. Composite Key. A Composite key is a composed (combination) key from one or more keys to identify a single row uniquely from database table. Some …
Constraints in SQL Server Examples - Dot Net Tutorials
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Defining Composite Primary and Foreign Keys - IBM
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