小编pop*_*ack的帖子

是否必须在PL/SQL中为OUT参数赋值？

create or replace procedure ppp(ot OUT number)
is
begin
null;
end;
/

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这在被调用时工作正常.

oracle plsql out-parameters

pop*_*ack

lucky-day

1
推荐指数

1
解决办法

4366
查看次数

即使子表为空,父表的截断也受到限制吗？

我可以用delete from table_name哪个有效.
为什么不truncate呢？

oracle truncate parent-child cascading-deletes

pop*_*ack

2012 03-02

1
推荐指数

1
解决办法

657
查看次数

HTML/CSS:重叠文本周围的公共边框

如何为此编码？

在此输入图像描述

当我们有这个:
在此输入图像描述

如

<html>
    <head>
        <style>             
            h2
            {
                letter-spacing:4pt;
                font-size:40pt;
                color:blue;
                text-align:center;
                position:absolute;
                top:0px;
            }
            h3
            {
                letter-spacing:4pt;
                font-size:40pt;
                color:blue;
                text-align:center;
                position: absolute;
                top:20px;
                left:20px;
            }
        </style>
    </head>

    <body>
        <h2>All right, Mate?</h2>
        <h3>All right, Mate?</h3>
    </body>
</html>
</html>

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...而不更改原始功能/标签.
只添加(或修改)一点.

html css styles position border

pop*_*ack

2012 05-23

0
推荐指数

1
解决办法

295
查看次数

为什么这两个查询不同？

显示订阅了足球和国际象棋而不是网球的员工的详细信息.

SELECT *
FROM   employee
WHERE  empid IN (SELECT empid
                 FROM   subscription
                 WHERE  facid IN (SELECT facid
                                  FROM   facility
                                  WHERE  facility = 'Chess'
                                          OR facility = 'Football'))
       AND empid NOT IN (SELECT empid
                         FROM   subscription
                         WHERE  facid = (SELECT facid
                                         FROM   facility
                                         WHERE  facility = 'Tennis'));

SELECT DISTINCT empid
FROM   subscription
WHERE  facid IN (SELECT facid
                 FROM   facility
                 WHERE  facility = 'Chess'
                         OR facility = 'Football')
       AND facid != (SELECT facid
                     FROM   facility
                     WHERE  facility = 'Tennis');

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第一个给出正确的结果.

sql relational-algebra logical-operators

pop*_*ack

2012 01-05

-5
推荐指数

1
解决办法

86
查看次数