LOCK TABLE --+-+--> <table-name> --+-+--> FOR -+-->lock-mode MODE --++
               | +-------- , <-------+ +--> IN --+                    ||
               +--------------------- , <-----------------------------+|
  +------------------------------------ <------------------------------+
  +------------+----------------------------+-------------------------->
               +-----> NOWAIT --------------+
               +--+-------------+--> WAIT --+
                  +--> DEFAULT -+

  lock-mode =

  ---+---> SHARED  -----+---+---> DATA DEFINITION -+-->
     +---> PROTECTED ---+   +---> READ ------------+
     +---> EXCLUSIVE ---+   +---> WRITE -----------+