oracle存储过程如何根据条件编写

oracle存储过程如何实现如果select * from a where id = 1，没有值时执行
select * from a where name = 'aa',如果还没有值，插入一条记录

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declare
v_count1 pls_integer;
v_count2 pls_integer;
begin
select count(*) into v_count1 from a where id = 1;
select count(*) into v_count2 from a where name = 'aa';
IF v_count1=0 AND v_count2=0 THEN
INSERT INTO 表
(字段1,字段2)
VALUES
(内容1,内容2);
END IF;
end;

insert when (not exists (select 1 from a where id = 1)) then
into a(...字段) values(...值)

insert when (not exists (select 1 from a where id = 1)) then
into a(...字段) values(...值)