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<lock_statement>::=
  LOCK [(WAIT)|(NOWAIT)] <lock_spec> IN SHARE MODE
| LOCK [(WAIT)|(NOWAIT)] <lock_spec> IN EXCLUSIVE MODE
| LOCK [(WAIT)|(NOWAIT)] <lock_spec> IN SHARE MODE <lock_spec> IN EXCLUSIVE MODE
| LOCK [(WAIT)|(NOWAIT)] <row_spec>... OPTIMISTIC