Re: debug stored procedures

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#347

From: Isaac
Date: Tue, 20 May 2008 23:01

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Quinn Wildman (CodeGear Developer Support) wrote:
> I don't understand why you even need coalesce here. NULL's do not effect 
> SUM. Let's consider a trivial example
> 
> create table t1 (f1 float);
> insert into t1 values (NULL);
> insert into t1 values (1.2);
> insert into t1 values (2.3);
> 
> Now, we know that NULL + 1.2 + 2.3 = NULL. However, select sum(f1) from 
> t1 returns 3.5. Isn't that what you want?
> 
> Isaac wrote:
>> I think I found another bug or a defect that I cant use SUM with COALESCE
>>
>> I tried SUM(COALESCE(QTY, cast(0 AS FLOAT)))
>>
>> and get this error:
>> Unsuccessful execution caused by system error that does not preclude 
>> successful execution of subsequent statements.
>> data type not supported for arithmetic.
no I introduced this sql as a part of a stored procedure contain many 
selects some tables are empty so if one table is empty it will return 
null and in my final equation

ex:
e = table_1_result_value (5) + table_1_result_value (20) + 
table_1_result_value (null) = NULL not (25) I will go and use IFs for now

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