oracle:觸發、分頁
阿新 • • 發佈:2018-12-26
分頁解釋:
int index=1;
int size=5;
int start=(index-1)*size+1;
int end=index*size;
--1 1 5
--2 6 10
where mr between 6 and 10
select * from(select a.*,rownum mr from emp a) where mr>=6 and mr<=10
觸發:
create or replace function f(x number) return number is begin if x=1 then return 1; else return f(x-1)+x; end if; end; select f(100) s from dual --1 2 3 4 10 100 --1 3 6 10 55 5050 begin for i in 97..122 loop dbms_output.put_line(chr(i)); end loop; end; --ASC create or replace trigger dept_line_delete before delete on dept for each row declare v1 number; begin select count(*) into v1 from emp where deptno=:old.deptno; if v1>=1 then RAISE_APPLICATION_ERROR(-20000,’錯誤’); end if; end; --當EMP表中部門號存在時,該部門不允許刪除