Oracle一则诡异的程序
- WBOYOriginal
- 2016-06-07 17:45:47875browse
function chkA_B return varchar2 as
a varchar2(10):=NULL;
b varchar2(10):='1';
begin
if a=b then
return 'Error';
end if;
return 'ok';
end;
这段程序诡异地返回ok,而不是Error. 通过跟踪，程序进入了 return 'error' .但是紧接着也执行了return 'ok'.
如果将if 的条件改为 if nvl(a,'0')=b 则程序正常。
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