详解Oracle数据库各类控制语句的使用

If elsif else end if  
set serverout on;  
declare per_dep_count number;  
begin  
select count() into per_dep_count from emp;  
if per_dep_count>0 then  
dbms_output.put_line('Big Than 0');  
elsif per_dep_count>5 then <span style="font-size:24px;color:#ff0000;"><strong>--elsif not elseif!!!!   
</strong></span>        dbms_output.put_line('Big Than 5');  
else  
dbms_output.put_line('En?');  
end if;  
end; 

declare per_dep_count number;  
begin  
select count() into per_dep_count from emp;  
case per_dep_count  
when 1 then  
dbms_output.put_line('1');  
when 2 then  
dbms_output.put_line('2');  
else  
dbms_output.put_line('else');  
end case;  
end;  

declare per_dep_count number;  
begin  
select count() into per_dep_count from emp;  
case   
when per_dep_count=1 then  
dbms_output.put_line('1');  
when per_dep_count=2 then  
dbms_output.put_line('2');  
else  
dbms_output.put_line('else');  
end case;  
end;  

declare v_id number:=0;  
begin  
while v_id<5 loop  
v_idv_id:=v_id+1;  
dbms_output.put_line(v_id);  
end loop;  
end;  

declare v_id number:=0;  
begin  
for v_id in 1..5 loop  
dbms_output.put_line(v_id);  
end loop;  
end;