Learn about typical challenges in legal information retrieval, the techniques used in querying data by determining its legal relevance, and how SQL Server 2016 can be used to simplify some of these techniques. For instance, a very important element of legal proceedings is determining which law should be used. Legal rules change over time, resulting in multiple versions of the same law. Laws do not last forever and can be replaced by other laws (one old law can be replaced by one or more new laws). The timeline of events that are relevant to a particular court case provide one set of criteria to be used to determine the correct law and the correct version of the law.