Sql Case When Null Kullanımı. Whereas distinct number of cases in variable y is equal to 2. The syntax noted above is ansi sql standard and the converse would be startdate is not null.
Null is also never not equal to null. I am using sql server. Sql offers two case abbreviations to cope with null.
The keyword distinct is used to remove or ignore duplicate records.
Select declare at doc columnname datatypecasecharactermaximumlength when null then else convertvarchar12charactermaximumlength end from informationschemacolumns where tablename documentos. In the above code snippet we have passed x 1 and y 2 as arguments to nullif function. Columnalias can be used in an order by clause but it cannot be used in a where group by or having clause. The simplest is to remove the else and let it implicitly get the value null instead for the second case.