PL/SQL块结构:
1. 匿名块
[DECLARE]
BEGIN
-- statements
[EXCEPTION]
END;
2. 过程
PROCEDURE name
[(参数列表)]
IS
[DECLARE]
BEGIN
-- statements
[EXCEPTION]
END;
3. 函数
FUNCTION name
[(参数列表)]
RETURN datatype
IS
[DECLARE]
BEGIN
-- statements
[EXCEPTION]
END;