Q is a proprietary array processing language developed by Arthur Whitney and commercialized by Kx Systems. The language serves as the query language for KDB+, a disk based and in-memory, column-based database. Kdb+ is based upon K, a terse variant of APL. Q is a thin wrapper around K, providing a more readable, English like interface.A column-oriented DBMS is a database management system (DBMS) which stores its content by column rather than by row. This has advantages for databases such as data warehouses and library catalogues, where aggregates are computed over large numbers of similar data items. This approach is contrasted with row-oriented or row store databases and with correlation databases, which use a value-based storage structure.

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