Install and Secure MongoDB 6.0 on CentOS 7

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Step 1: Add the MongoDB Repository First, create a .repo file for MongoDB. This will make sure you can install the latest stable version of MongoDB. Create the repo file: Add the next content to the file: 3. Save and exit: Press Ctrl + O to write out, then press Enter. Press Ctrl + X … Read more

Coalesce in SQL

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Coalesce is a SQL function used for handling NULL values. It returns the first non-null expression from the list. Each expression is evaluated for being NULL or not and the first non-null expression will be returned as the output. It takes at least two arguments in the list.