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條件控制語句

1.IF語句

支援的分支結構

IF-THEN-END IF

IF-THEN-ELSE-END IF

IF-THEN-ELSEIF-END IF

IF condition THEN

statements;

[ELSEIF condition THEN

statements;]

[ELSE

statements;]

END IF;

declare

v1 date := to_date('01-01-2016','mm-dd-yyyy');

v2 boolean;

begin

if months_between(sysdate,v1) >5 then

v2:= true;

dbms_output.put_line('true');

else

v2:=false;

dbms_output.put_line('false');

end if;

end;

/

2.CASE語句

declare

v1 char(1) := upper('&v1');

v2 varchar2(20);

begin

v2:= case v1

when 'A' then 'grade is A'

when 'B' then 'grade is B'

when 'C' then 'grade is C'

else 'no such grade'

end;

dbms_output.put_line(v2);

end;

/