select * from tt3

-- 20年后多少岁

declare

age tt3.age%type;

dif tt3.age%type;

begin

select age into age from tt3 where id=1;

dif := 20; -- 设置一个年龄差

age:= age + dif;

dbms_output.put_line(age);

end;

------------------------------

declare

age tt3.age%type;

dif tt3.age%type :=20; -- 设置一个年龄差

begin

select age into age from tt3 where id=1;

age:= age + dif;

dbms_output.put_line(age);

end;

-------------------

declare

age tt3.age%type;

dif tt3.age%type :=20; -- 设置一个年龄差

begin

select age+dif into age from tt3 where id=1;

dbms_output.put_line(age);

end;

-------------------

declare

age tt3.age%type;

dif age%type :=21; -- 设置一个年龄差

begin

select age+dif into age from tt3 where id=1;

dbms_output.put_line(age);

end;

select * from tt3 where id=1;

-- 不需要一个字段一个字段写出来

declare

my_user tt3%rowtype;

begin

select * into my_user from tt3 where id=1;

dbms_output.put_line( my_user.user_name );

end;

declare

my_user tt3%rowtype;

show_message varchar2(200);

begin

select * into my_user from tt3 where id=1;

show_message:= my_user.user_name || '住在' || my_user.city;

dbms_output.put_line( show_message );

end;

----------

declare

my_user tt3%rowtype;

show_message varchar2(200);

begin

select * into my_user from tt3 where id=1;

show_message:= my_user.user_name || '住在' || my_user.city||',年龄：'||my_user.age||'岁';

dbms_output.put_line( show_message );

end;

---------------

declare

my_user tt3%rowtype;

show_message varchar2(200);

dif number :=20;

begin

select * into my_user from tt3 where id=1;

show_message:= my_user.user_name || '住在' || my_user.city||',年龄：'||my_user.age||'岁，二十年后'||(my_user.age+dif);

dbms_output.put_line( show_message );

end;