sybase null value check

The NULL value is a special value that is different from any valid value fo...

The NULL value is a special value that is different from any valid value for any data type. However, the NULL value is a legal value in any data type. The NULL.

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isnull, a system function, substitutes the value specified in expression2 w...

isnull, a system function, substitutes the value specified in expression2 when expression1 evaluates to NULL. For general information about system functions.

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Local variables are assigned the value NULL when they are declared, and may...

Local variables are assigned the value NULL when they are declared, and may be assigned the null value by a select statement. create table #test(i int not null, a char(5) null) insert into #test(i) values (1). This example.

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The syntax for IS NULL conditions is: expression IS [ NOT ] NULL. Without t...

The syntax for IS NULL conditions is: expression IS [ NOT ] NULL. Without the NOT keyword, the IS NULL condition is TRUE if the expression is the NULL value.

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Anything = or to Null results in Unknown which is treated as false for . If...

Anything = or to Null results in Unknown which is treated as false for . If you check the field labeled SwitchDispId it could have a 1 or 2 in it.

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Does this do what you want? SELECT * FROM UserProfile WHERE Propertydefinit...

Does this do what you want? SELECT * FROM UserProfile WHERE PropertydefinitionID in (40, 53) AND (PropertyValue is NULL or.

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I am trying to write some thing like this in sybase ASE is a sub-section ab...

I am trying to write some thing like this in sybase ASE is a sub-section about using Variables and NULL values inside a control block such as.

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So I did this test: The quick answer is that Sybase ASE treats NULLs differ...

So I did this test: The quick answer is that Sybase ASE treats NULLs differently in search Transact-SQL treats NULL values differently.

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There it returns a boolean value meaning whether the expression is NULL or ...

There it returns a boolean value meaning whether the expression is NULL or not. So this might confuse colleagues coming from different DBMS.

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with 'where colname Is Null' as a test for Null values in a colum...

with 'where colname Is Null' as a test for Null values in a column. What is the correct syntax, are 'where colname = Null' and 'where colname IS Null' equivalent SELECT in T-SQL is overloaded; it is (also) Sybase ASE's  CASE Expression with Null Values.

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The presence of null values in a column from one of the tables being joined...

The presence of null values in a column from one of the tables being joined can be returned only by using an outer join (unless the WHERE c.

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I MUST accept a null value (not a hypothetical date such as ). but that wil...

I MUST accept a null value (not a hypothetical date such as ). but that will break logics in many application where we check for null (as oppose to a fake date). Datetime columns in Sybase should allow Nulls.

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I need to check in my Stored procedure if the information passed is null or...

I need to check in my Stored procedure if the information passed is null or empty so I can decided to insert the new value or keep the old.

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Those test results and possibilities given below. var =null Sybase/SQL Serv...

Those test results and possibilities given below. var =null Sybase/SQL Server Not null (Same value) ='constant' -Yes/Yes -ISNULL.

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One of the most common questions SQL beginners have is why NULL values “don...

One of the most common questions SQL beginners have is why NULL values “don't work right” in WHERE clauses. In this article I'll explain it in.

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