title: Can't use sqldf on my data frame anymore (Error in sqliteExecStatement)
body: <p>(I'm rather new to R.)</p>
  
  <p>I don't know why I get the following error:</p>
  
  <pre><code>&gt; apps.rsd.c &lt;- sqldf("SELECT appid FROM apps.rsd WHERE rcount &gt; 50")
  Error in sqliteExecStatement(con, statement, bind.data) : 
    RS-DBI driver: (error in statement: no such table: apps.rsd)
  </code></pre>
  
  <p>I thought these might help, I tried to compare them to data frames which let me work with sqldf, but didn't see what causes the error:</p>
  
  <pre><code>&gt; dput(head(apps.rsd))
  structure(list(appid = c(173L, 717L, 996L, 209L, 602L, 255L), 
    cid = c(4L, 15L, 21L, 5L, 13L, 6L), price = c(0, 0, 0, 1.99, 
    0, 0.76), count = c(411, 411, 210, 18, 921, 22), sum = c(1226, 
    1870, 871, 66, 3948, 86), mean = c(2.98296836982968, 4.54987834549878, 
    4.14761904761905, 3.66666666666667, 4.28664495114007, 3.90909090909091
    ), sd = c(1.73897694746568, 0.958668345866094, 1.31370760232218, 
    1.7950549357115, 1.33373734360862, 1.62114131819336), rcount = c(3, 
    3, 3, 5, 5, 7), rsum = c(7, 0, 0, 13, 0, 19), rsd = c(2.3094010767585, 
    2.3094010767585, 2.3094010767585, 2.19089023002066, 2.19089023002066, 
    2.1380899352994)), .Names = c("appid", "cid", "price", "count", 
  "sum", "mean", "sd", "rcount", "rsum", "rsd"), class = c("data.table", 
  "data.frame"), row.names = c(NA, -6L), .internal.selfref = &lt;pointer: 0x7fd3bc807b78&gt;)
  
  &gt; str(apps.rsd)
  Classes ‘data.table’ and 'data.frame':  1518 obs. of  10 variables:
    $ appid : int  173 717 996 209 602 255 1473 442 672 772 ...
    $ cid   : int  4 15 21 5 13 6 31 10 14 17 ...
    $ price : num  0 0 0 1.99 0 0.76 0 7.98 0 0.75 ...
    $ count : num  411 411 210 18 921 22 113 54 564 33 ...
    $ sum   : num  1226 1870 871 66 3948 ...
    $ mean  : num  2.98 4.55 4.15 3.67 4.29 ...
    $ sd    : num  1.739 0.959 1.314 1.795 1.334 ...
    $ rcount: num  3 3 3 5 5 7 7 2 2 2 ...
    $ rsum  : num  7 0 0 13 0 19 0 5 0 0 ...
    $ rsd   : num  2.31 2.31 2.31 2.19 2.19 ...
    - attr(*, ".internal.selfref")=&lt;externalptr&gt; 
  </code></pre>