Add fiel to list keywords.

src/tools/SQL_keywords

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+These are the standard SQL'92 keywords:
+absolute
+action
+add
+all
+allocate
+alter
+and
+any
+are
+as
+asc
+assertion
+at
+authorization
+avg
+begin
+between
+bit
+bit_length
+both
+by
+cascade
+cascaded
+case
+cast
+catalog
+char
+character
+char_length
+character_length
+check
+close
+coalesce
+collate
+collation
+column
+commit
+connect
+connection
+constraint
+constraints
+continue
+convert
+corresponding
+count
+create
+cross
+current
+current_date
+current_time
+current_timestamp
+current_user
+cursor
+date
+day
+deallocate
+dec
+decimal
+declare
+default
+deferrable
+deferred
+delete
+desc
+describe
+descriptor
+diagnostics
+disconnect
+distinct
+domain
+double
+drop
+else
+end
+end-exec
+escape
+except
+exception
+exec
+execute
+eists
+external
+extract
+false
+fetch
+first
+float
+for
+foreign
+found
+from
+full
+get
+global
+go
+goto
+grant
+group
+having
+hour
+identity
+immediate
+in
+indicator
+initially
+inner
+input
+insensititve
+insert
+int
+integer
+intersect
+interval
+into
+is
+isolation
+join
+key
+language
+last
+leading
+left
+level
+like
+local
+lower
+match
+max
+min
+minute
+module
+month
+names
+national
+natural
+nchar
+next
+no
+not
+null
+nullif
+numeric
+octet_length
+of
+on
+only
+open
+option
+or
+ordered
+outer
+output
+overlaps
+partial
+postion
+precision
+prepare
+preserve
+primary
+prior
+privledges
+procedure
+public
+read
+real
+references
+relative
+restrict
+revoke
+right
+rollback
+rows
+schema
+scroll
+second
+section
+select
+session
+session_user
+set
+size
+smallint
+some
+sql
+sqlcode
+sqlerror
+sqlstate
+substring
+sum
+system_user
+table
+temporary
+then
+time
+timestamp
+timezone_hour
+timezone_minute
+to
+trailing
+transaction
+translate
+translation
+trim
+true
+union
+unique
+unknown
+update
+upper
+usage
+user
+using
+value
+values
+varchar
+varying
+view
+when
+whenever
+where
+with
+work
+write
+year
+zone

src/tools/make_keywords.README

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+To get a list of keywords compared to SQL'92, take the keywords out of
+backend/parser/keywords.c and tools/SQL_keywords.
+
+Then run sdif with the PostgreSQL keyword file first, then the SQL'92
+keywords.