Postgresql select case null

ILIKE is used to compare a string value with a pattern with case-insensitive properties that is it does not compare string values according to their case, it only compares according to the pattern provided.

We will look at an example of case-insensitive LIKE, i. Here we have used the CASE expression to process data according to two columns and similarly, we can use as many columns in a CASE expression to get the results. Also we have covered these topics:. Bijay is an entrepreneur, a technical blogger, and passionate about driving, wrote tons of articles in his own blogs EnjoySharePoint. Enjoy my SQL Server tutorials.

At A Glance - Here's what we'll cover: show. Bijay Kumar Sahoo. If two expressions provided are equal, then it provides a null value; as a result, otherwise, it will return the first expression as a result. Select Argument1 First value which is used to handle null values , Argument2 Second value which is used to handle null values.

In the below example, we have passing values like 50 and Nullif function will return null values because both the arguments which we have passing are the same. In the above example, we have the passing the same argument with the nullif function so that it will return the null value as a result. In the below example, we have passing values as 50 and Nullif function will return the first value, i.

In the above example, we have a passing different argument with the nullif function so that it will return the first value as a result. Improve this question. Boucherie Boucherie 3 3 silver badges 18 18 bronze badges. Add a comment. Active Oldest Votes. So in your case you could simply use: coalesce categories.

Improve this answer. What if I need it to remain in the case expression? Boucherie: So? You can change it in the coalesce call too. Do I have to change the whole structure of the expression? Please keep in mind that I normally work in ActiveRecord and am a bit out of my depth here. Boucherie: The question was about SQL. Unless there's probably an ActiveRecord way of doing this. But that would be another question then. Understood, I was only trying to convey that I needed a bit more explanation to your last comment.