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如何去掉存储过程返回记录中的<null>? 请大家帮助，多谢了
我的存储过程如下：
---------------------
ALTER PROCEDURE PeriodStatement
(@ac_number char(8),
@beginning_date datetime,
@ending_date datetime
)
AS
/* SET NOCOUNT ON */
select date,payment_type,Description,paid_out,Paid_in
from trans_details
where ac_number=@ac_number and
date between @beginning_date and @ending_date
order by date
运行结果如下：
-------------
date payment_type Description paid_out Paid_in
----------------------- ------------ -------------------- --------------------- ---------------------
2003-11-3 TFR Internet Transfer <NULL> 496.37
2003-11-4 CHQ 1000007 <NULL> 155
2003-11-5 CR Cash Paid out 200 <NULL>
2003-11-7 CR Cash Paid in <NULL> 80
没有更多的结果。
..
as
select IsNull(date,) as date,
isnull(payment_type,) as payment_type,
isnull(description,) as Description,
isnull(paid_out,0) as paid_out,
isnull(paid_in,0) as Paid_in
from trans_details
where ac_number=@ac_number and
date between @beginning_date and @ending_date
order by date
ISNULL
使用指定的替换值替换 NULL。
语法
ISNULL ( check_expression , replacement_value )
参数
check_expression
将被检查是否为 NULL的表达式。check_expression 可以是任何类型的。
replacement_value
在 check_expression 为 NULL时将返回的表达式。replacement_value 必须与 check_expresssion 具有相同的类型。
返回类型
返回与 check_expression 相同的类型。
注释
如果 check_expression 不为 NULL，那么返回该表达式的值；否则返回 replacement_value。
示例
A. 将 ISNULL 与 AVG 一起使用
下面的示例查找所有书的平均价格，用值 $10.00 替换 titles 表的 price 列中的所有 NULL 条目。
USE pubs
GO
SELECT AVG(ISNULL(price, $10.00))
FROM titles
GO
下面是结果集：
--------------------------
14.24
(1 row(s) affected)
B. 使用 ISNULL
下面的示例为 titles 表中的所有书选择书名、类型及价格。如果一个书名的价格是 NULL，那么在结果集中显示的价格为 0.00。
USE pubs
GO
SELECT SUBSTRING(title, 1, 15) AS Title, type AS Type,
ISNULL(price, 0.00) AS Price
FROM titles
GO
下面是结果集：
Title Type Price
--------------- ------------ --------------------------
The Busy Execut business 19.99
Cooking with Co business 11.95
You Can Combat business 2.99
Straight Talk A business 19.99
Silicon Valley mod_cook 19.99
The Gourmet Mic mod_cook 2.99
The Psychology UNDECIDED 0.00
But Is It User popular_comp 22.95
Secrets of Sili popular_comp 20.00
Net Etiquette popular_comp 0.00
Computer Phobic psychology 21.59
Is Anger the En psychology 10.95
Life Without Fe psychology 7.00
Prolonged Data psychology 19.99
Emotional Secur psychology 7.99
Onions, Leeks, trad_cook 20.95
Fifty Years in trad_cook 11.95
Sushi, Anyone? trad_cook 14.99
COALESCE(COLNAME,)
select IsNull(date,) as date,
isnull(payment_type,) as payment_type,
isnull(description,) as Description,
isnull(paid_out,0) as paid_out,
isnull(paid_in,0) as Paid_in
select case isnull(date,0:00:00)=0:00:00 then end as [date],... 其它照办from trans_details
where ac_number=@ac_number and
date between @beginning_date and @ending_date
order by date
