eliminate duplicate results; order by data properly

documentation/TODO.md

@@ -1,4 +1,3 @@
-+ make case insensitive search optional
-+ make fuzzy searching optional
 + make (potentially slow) queries cancel using multi threading
-+ the same suggestion should only show up once
++ levenstein seems horribly buggy with single character results
++ rebinding queries should be faster than repreparing them

source/storage.cpp

@@ -15,24 +15,32 @@ bool is_caseless   = false;
 const char * const literal_query =
     "SELECT * FROM entries "
         "WHERE data GLOB CONCAT('*', ?, '*') "
+        "GROUP BY data "
+        "ORDER BY stamp DESC "
         "LIMIT ? "
         "OFFSET ?;"
 ;
 const char * const literal_caseless_query =
     "SELECT * FROM entries "
         "WHERE data LIKE CONCAT('%', ?, '%') "
+        "GROUP BY data "
+        "ORDER BY stamp DESC "
         "LIMIT ? "
         "OFFSET ?;"
 ;
 const char * const levenstein_query = 
     "SELECT * FROM entries "
-        "ORDER BY DAMERAU_LEVENSHTEIN_SUBSTRING(data, ?) "
+        "GROUP BY data "
+        "ORDER BY DAMERAU_LEVENSHTEIN_SUBSTRING(data, ?), "
+            "stamp DESC "
         "LIMIT ? "
         "OFFSET ?;"
 ;
 const char * const levenstein_caseless_query =
     "SELECT * FROM entries "
-        "ORDER BY DAMERAU_LEVENSHTEIN_SUBSTRING(LOWER(data), LOWER(?)) "
+        "GROUP BY data "
+        "ORDER BY DAMERAU_LEVENSHTEIN_SUBSTRING(LOWER(data), LOWER(?)), "
+            "stamp DESC "
         "LIMIT ? "
         "OFFSET ?;"
 ;