Read Part 1: Migrating From Sakila-MySQL to Couchbase - ETL
Read Part 2: Migrating from Sakila-MySQL to Couchbase - Part 2: Views and User-Defined Functions
Migrating from Sakila-MySQL to Couchbase – Part 4: Triggers
Using N1QL With Couchbase Eventing Functions
"Now, this is not the end. It is not even the beginning of the end. But it is, perhaps, the end of the beginning." — Winston Churchill
Updating data is usually not the end, but usually progress of a workflow. Shipping follows ordering; inventory update follows shipping; adjusting credit follows returning; The next step in the process is required to act to keep the workflow going. The workflows can be simple with few steps or complex with hundreds of steps. Business Process Management (BPM) is an industry by itself.
Couchbase 5.5 introduced Evening service. Developers can write a Javascript function to execute upon a change to the data. We refer to inserts, Updates, Merges, and Deletions together as mutations. Multiple specific use cases have been documented for developing these eventing functions.
Top 30 SQL Interview Questions and Answers
Here I am discussing commonly asked SQL interview questions and answers for a fresher and more experienced level.
1. What Is SQL?
SQL (Structured Query Language) is a database which was design to retrieve and manipulate data. It is a Standard of an American National Standard Institute(ANSI). This language is used to perform tasks on data such as Select, Update, Delete and Insert.