Oracle decode is null check

In the searched case every case has its own expression. This can for instance be helpful when using ranges. The else clause is optional. NULL values are one of the most mind-boggling values in the Oracle database. Find out more.

Fortnightly newsletters help sharpen your skills and keep you ahead, with articles, ebooks and opinion to keep you informed. View all articles by Patrick Barel. FROM emp t. WHERE t. NVL expr1 , expr2. NVL2 expr1 , expr2 , expr3. LNNVL condition. FROM emp e. This article provides a summary of the functions available for handling null values. For a more detailed description follow the links are the bottom of the article.

The NVL function allows you to replace null values with a default value. If the value in the first parameter is null, the function returns the value in the second parameter. If the first parameter is any value other than null, it is returned unchanged. See the examples section for more information on how to do this.

See the example section below for more information. I find that examples are the best way for me to learn about code, even with the explanation above. This is the same query as above, but with a default value. As you can see, any record where employees is greater than 20 will show one value, and less than will show another value. You can find a full list of Oracle functions here. You can use the SIGN function to determine if a number is positive or negative, or use greater than or less than.

So,please send the syntax and which function used in this problem. Learn more. Asked 9 years, 10 months ago. Active 6 years, 4 months ago. Viewed 87k times. Improve this question. Burhan Ali 2, 1 1 gold badge 25 25 silver badges 38 38 bronze badges. Arav Arav 4, 20 20 gold badges 67 67 silver badges bronze badges.

NpotentialValue, result, elsevalue Case statements are a bit easier to read so are preferred by some. Saves posting and waiting for an answer. Add a comment.