Msdn sql case is null

It might help to discover where the real problem is at. Add a comment. Active Oldest Votes. Nick Nick k 20 20 gold badges 45 45 silver badges 77 77 bronze badges.

Gaurav Pareek Gaurav Pareek 1 1 1 bronze badge. Abhishek Agarwal Abhishek Agarwal 43 7 7 bronze badges. This is not what I want.. Kovi I'd just update my query. Now it will work fine as per expected — Abhishek Agarwal.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. In either case, different results can be returned between the first evaluation and upcoming evaluations. As a result, you can get different results depending on the isolation level of the query. As an alternative, you can rewrite the query to push the subquery into a subselect as shown in the following example:.

Data type determination of the resulting expression is different. These values make a difference if you're using these expressions in computed columns, creating key constraints or making the return value of a scalar UDF deterministic so that it can be indexed as shown in the following example:.

This example uses the AdventureWorks database. In the following example, the wages table includes three columns that contain information about the yearly wages of the employees: the hourly wage, salary, and commission. However, an employee receives only one type of pay. Assume for this example that the Products table contains this data:. No two null values are equal. Comparisons between two null values, or between a null value and any other value, return unknown because the value of each NULL is unknown.

Null values generally indicate data that is unknown, not applicable, or to be added later. For example, a customer's middle initial may not be known at the time the customer places an order.

Null values cannot be used as information that is required to distinguish one row in a table from another row in a table, such as primary keys, or for information used to distribute rows, such as distribution keys. This need for three-valued logic is a source of many application errors.