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CREATE DATABASE db1; USE db1; CREATE TABLE t1 (val INT); CREATE TRIGGER IF NOT EXISTS val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + NEW.val; SET @sum=0; INSERT INTO t1 VALUES (10), (20), (30); SELECT @sum; CREATE TRIGGER IF NOT EXISTS val_sum_new BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + NEW.val; CREATE TRIGGER IF NOT EXISTS val_sum AFTER INSERT ON t1 FOR EACH ROW SET @sum = @sum + 1 + NEW.val; --error ER_WRONG_USAGE CREATE OR REPLACE TRIGGER IF NOT EXISTS val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 2 + NEW.val; SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum'; CREATE OR REPLACE TRIGGER val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 3 + NEW.val; SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum'; --error ER_TRG_ALREADY_EXISTS CREATE TRIGGER val_sum BEFORE INSERT ON t1 FOR EACH ROW SET @sum = @sum + 4 + NEW.val; SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum'; --echo # Clearing up DROP TRIGGER IF EXISTS val_sum; SELECT ACTION_STATEMENT FROM INFORMATION_SCHEMA.TRIGGERS WHERE TRIGGER_NAME='val_sum'; DROP TRIGGER IF EXISTS val_sum; DROP TABLE t1; DROP DATABASE db1;