Microservices are a popular and wide-spread architectural style for building non-trivial applications. They offer immense advantages but also some challenges and traps. Some obvious, some of a more insidious nature. In this brief article, I want to focus on how to integrate microservices. This overview explains and compares common patterns for dealing with data in microservice architectures. I neither assume to be complete regarding approaches nor do I cover every pros and cons of each pattern.