ORALCE的几种IF条件判断语句

1. 撒子是IF...THEN...条件语句

格式：

IF THEN

END IF;

declare

x number :=9;

begin

if x<10 then

dbms_output.put_line('x is less than10');

end if;

end;

/

x is less than10

PL/SQL 过程已成功完成。

declare

x number :=9;

begin

if x<10 then

insert into testloop values(1111);

end if;

end;

/

SQL> select * from testloop;

A

----------

1111

2.撒子是IF...THEN...ELSE...条件语句

格式：

IF THEN

ELSE

END IF;

declare

x number :=20;

begin

if x<10 then

insert into testloop values(1111);

else

insert into testloop values(2222);

end if;

end;

/

SQL> select * from testloop;

A

----------

1111

11143431

2222

3.撒子是IF...THEN...,ELSEIF THEN...,ELSEIF...THEN,ELSE...END IF;

格式：

IF THEN

ELSIF THEN

ELSIF THEN

ELSE

END IF;

DECLARE

x NUMBER(3) := 47;

BEGIN

IF x < 10 THEN

dbms_output.put_line('X is less than 10');

ELSIF x = 10 THEN

dbms_output.put_line('X is equal to 10');

ELSIF x < 100 THEN

dbms_output.put_line('X is between 11 and 99');

ELSE

dbms_output.put_line('X is greater than 99');

END IF;

END;

/