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How would you handle NULL problems?

+3 votes

(ie. NULL - 25 = ?)​

posted Jun 30, 2015 by Manikandan J

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1 Answer

0 votes
 create table tbltest
id int identity(1,1),
name varchar(12),
city varchar(200)
insert into tbltest(name,city)values

select *from tbltest

 select *from tbltest where isnull(city,'')<>'merrut'
answer Jul 1, 2015 by Shivaranjini
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+1 vote

I want to have compatible SQL for both Oracle database and Microsoft SQL server.

I want a compatible SQL expression that will return true for not null and not empty strings.

If I use:

column <> ''

it will work on Microsoft SQL server but not on Oracle database (as '' is null for Oracle)

If I use:

len(column) > 0

it will work on Microsoft SQL server but not on Oracle database (since it uses length() )

+2 votes

I have two tables to join with a column (say emp_id).. if emp_id in both the tables have null values, how will SQL Server and Oracle treat???

I read that informatica will neglect the NULL rows when joining..if I handle the null, by substituting -1, a cross-join will happen which i don't want..

What can I do here? (I cannot completely neglect the rows which has NULL)