table alias on update and delete query

is there no table alias on update and dml query?  is there workaround?

egg=# update lw_pres p1 set pid=pid+1 
egg(# where exists( select 1 from lw_pres p2
egg(# where p1.pid = p2.pid and p1.oid < p2.oid );

ERROR:  parser: parse error at or near "p1"


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