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SQLize.online is a free online SQL environment for quickly running, experimenting with and sharing code.
You can run your SQL code on top of the most popular RDBMS including MySQL, MariaDB, SQLite, PostgreSQL, Oracle and Microsoft SQL Server.
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CREATE TABLE employee_history( operation_id serial, operation_type text, operation_time timestamp, operation_user text, new_name text, new_salary text ); CREATE OR REPLACE FUNCTION employee_change_history_row() RETURNS TRIGGER AS $$ BEGIN INSERT INTO employee_history(operation_type, operation_time, operation_user, new_name, new_salary) VALUES (TG_OP, current_timestamp, current_user, NEW.name, NEW.salary); RETURN NEW; END $$ LANGUAGE 'plpgsql'; CREATE OR REPLACE TRIGGER employee_change_history_trigger BEFORE INSERT OR UPDATE ON employee FOR EACH ROW EXECUTE FUNCTION employee_change_history_row(); INSERT INTO employee(name, salary) VALUES('Katara', 20); UPDATE employee SET salary = salary + 100 WHERE name = 'Katara' OR name = 'Aang'; UPDATE employee SET salary = 0 WHERE name = 'Zuko'; SELECT * FROM employee_history;
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MariaDB 10 Sakila (ReadOnly)
MySQL 5.7
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MySQL 8.0 Sakila (ReadOnly)
SQLite 3
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PostgreSQL 11
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