详解Oracle数据库各类控制语句的使用_oracle_

 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 --elsif not elseif!!!!  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;