“When storing an email address in a SQL Server table, is it more performant to store it as a hashed value rather than plain text?” This question was asked by one of our Remote Database Administration clients, to much speculation around the (remote) office. So, let’s find out by generating some data and running some simple tests. First things first: We’ll use the 50GB version of the StackOverflow2013 database, which contains 2.3million user records. You can get from here if you want to try this out yourself. These tests are carried out using SQL Server 2019, compatibility mode 130 (2016).