1. A method, comprising: receiving sequence data, the sequence data comprising reads from one or more sequence data sources, each read including a sequence and a location coordinate, the location coordinate indicating a location of the sequence on a reference sequence; defining a sequence table, the sequence table being a database table having a sequence data field and a location data field; distributing the sequence data to a plurality of nodes of a parallel processing database system based on a distribution key, each node of the parallel processing database system comprising a processor configured to process a portion of the sequence table stored on the node locally to the processor and in parallel to other nodes, the distribution key comprising one or more data fields of the sequence table, wherein distributing the sequence data comprises: generating a data record for each read, a sequence data field of the data record storing a representation of the sequence of the read, and a location data field of the data record storing a representation of the location coordinate of the read; identifying a node for storing the data record based on the distribution key and content stored in one or more data fields of the data record that correspond to the one or more data fields of the distribution key; and storing the data record in a sequence table of the identified node; and executing a same database query on each of the nodes of the parallel processing database system, the database query operable to retrieve an attribute or summary of the sequence data.