Oracle sql case with null

This is done on insert only. If you modify the default during the life of the table, the new default will be applied from that moment on. Now how do you make sure a default is applied to columns already NULL?

It can for instance be used to build a decision table. Consider the following decision table:. The column in our table just holds the code instead of the value.

If we want to represent the value instead of the code we could write a query like this:. The case statement has two flavors. The simple case and the searched case. In the simple case the expression is written only once and depending on the result of this expression one of the possible cases is being used.

This can be helpful when you need to choose from a set of distinct values. In the searched case every case has its own expression. This can for instance be helpful when using ranges. Active Oldest Votes. Another probably more simple option would be: IIf [table3. EUID, dbo. Mosty Mostacho Mosty Mostacho Just to clarify, the initial query was written in Access, but the tables have since been exported to SQL Server , so I'm trying to create the equivalent of the query in SQL — ivorytux.

Youbaraj Sharma Youbaraj Sharma 1, 3 3 gold badges 16 16 silver badges 34 34 bronze badges. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. We will use the products table in the sample database for the demonstration. The following query uses the CASE expression to calculate the discount for each product category i. It returns the result expression r of the first Boolean expression e that evaluates to true.

In other words, Oracle evaluates each Boolean condition to determine whether it is true, and never evaluates the next condition if the previous one is true. Stack Overflow for Teams — Collaborate and share knowledge with a private group.

Create a free Team What is Teams? Collectives on Stack Overflow. Learn more. Select case when null Oracle Ask Question. Asked 2 years, 4 months ago. Active 2 years, 4 months ago. Viewed times. Improve this question.