[R] question on sqldf syntax

[GL]

trying to structure sql to merge two datasets. structure follows:

dbs.possible.combos (all possible combinations of dates and places)
Date Place
1/1/10 N-01
1/1/10 S-02
1/2/10 N-01
1/2/10 S-02
etc...

dbs.aggregate (the raw data aggregated by date and location)
Date Place Days
1/1/10 N-01 6
1/1/10 S-02 10
1/2/10 S-02 5


Trying to merge so I look-up the values for each possible combo 
dbs.final <- sqldf("select dbs.possible.combos$Date,
dbs.possible.combos$Place, dbs.possible.combos$Days FROM dbs.possible.combos
LEFT JOIN dbs.aggregate ON (dbs.possible.combos$Place = dbs.aggregate$Place)
AND (dbs.possible.combos$Date = dbs.aggregate$Date)")

Resulting in: 
Error in sqliteExecStatement(con, statement, bind.data) : 
  RS-DBI driver: (error in statement: near ".": syntax error)

What am I getting wrong in the syntax?
      



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