Oracle中的控制語句

set serverout on;

declare employee_number number;
begin
select count(*) into employee_count from employees where employee_age>30;
if employee_count>10 then
dbms_output.put_line('公司有年齡大於30的員工')；
else
dbms_output.put_line('公司沒有年齡大於30的員工')；
end if;
end

declare employee_number number;

begin
select count(*) into employee_count from employees where employee_age>30;
if employee_count=1 then
dbms_output.put_line('公司有1名年齡大於30的員工')；
elsif employee_count>1 then
dbms_output.put_line('公司有多年齡大於30的員工')；
else
dbms_output.put_line('公司沒有年齡大於30的員工')；
end if;
end

declare employee_number number;

begin
select count(*) into employee_count from employees where employee_age>30;
case employee_count
when 1 then
dbms_output.put_line('公司有1名年齡大於30的員工')；
when 0 then
dbms_output.put_line('公司沒有年齡大於30的員工')；
else
dbms_output.put_line('公司有多名年齡大於30的員工')；
end case
end

declare v_id number :=0;

v_name varchar2(20);
begin
loop
if v_id>=5 then
exit;--退出迴圈
end if;
v_id:=v_id+1;
select empolyee_name into v_name from employees where employee_id=v_id;
dbms_output.put_line(v_id||'號員工是'||v_name);
end loop;
end;

while 條件判斷 loop

迴圈操作
end loop；

declare v_id number :=0;

v_name varchar2(20);
begin
while v_id>=5
loop
v_id:=v_id+1;
select empolyee_name into v_name from employees where employee_id=v_id;
dbms_output.put_line(v_id||'號員工是'||v_name);
end loop;
end;

declare v_id number :=0;

v_name varchar2(20);
begin
for v_id in 1..5
loop
v_id:=v_id+1;
select empolyee_name into v_name from employees where employee_id=v_id;
dbms_output.put_line(v_id||'號員工是'||v_name);
end loop;
end;

Oracle中的迭代（迴圈）控制語句語法

1.簡單迴圈 loop sequence of statements end loop 例 declare a number 100 begin loop a a 25 exit when a 250 end loop dbms output.put line to char a 注意這裡用to c...

oracle控制語句if else，loop等

oracle中的控制語句 1.條件語句 if then else end if if then elsif then else end if case when then when then else end case case when then when then else end case s...

Oracle 條件控制語句

pl sql有3種型別的條件控制語句 if語句 elsif語句 case語句 1.if語句 if then語句 語法格式 if condition then statement endif if then else語句 語法格式 if condition then statement1 else s...