写一段sql语句的procedure，查找表1的数据，然后插入表2，如果出现主键冲突就不插入。在oracle中执行。

CREATE OR REPLACE PROCEDURE INSERT_TABLE2_FROM_TABLE1 AS
BEGIN
INSERT INTO TABLE2 (COLUMN1, COLUMN2, COLUMN3)
SELECT COLUMN1, COLUMN2, COLUMN3
FROM TABLE1
WHERE NOT EXISTS (
SELECT 1
FROM TABLE2
WHERE TABLE1.PRIMARY_KEY = TABLE2.PRIMARY_KEY
);
COMMIT;
END;