diff --git a/meson.build b/meson.build
index 69212eb1a1591ee8f49e40735784723630b0af1c..2e0e49cd6746c9ef6584349a8a7f346b439048f9 100644
--- a/meson.build
+++ b/meson.build
@@ -1,6 +1,6 @@
 # -*- mode: conf -*-
 project('zero-pinyin-service', ['c', 'cpp'],
-  version: '0.3.0',
+  version: '0.3.1',
   license: 'GPL',
   default_options: [
     'warning_level=2',
diff --git a/test-sql.sh b/test-sql.sh
index eb487a33a76e1c0030d81404f52f53f85af0c518..7a616ce83714654f7825a36c5a32f5a44b05b194 100755
--- a/test-sql.sh
+++ b/test-sql.sh
@@ -2,5 +2,5 @@
 sqlite3 -echo \
 	-cmd '.headers on' \
 	-cmd '.prompt "zerodb> " "   ...> "' \
-	-cmd 'attach "/usr/share/pyzy/db/open-phrase.db" as "maindb"; attach "/home/sylecn/.cache/ibus/pinyin/user-1.0.db" as "userdb";' \
+	-cmd 'attach "/home/sylecn/.cache/ibus/pinyin/main.db" as "maindb"; attach "/home/sylecn/.cache/ibus/pinyin/user-1.0.db" as "userdb";' \
 	':memory:'
diff --git a/zero-pinyin-service.c b/zero-pinyin-service.c
index 17545320eeac201de4a6f46337706870325bce87..2cfdab5c46186ead3caac5d72aa4d70fd10bfa11 100644
--- a/zero-pinyin-service.c
+++ b/zero-pinyin-service.c
@@ -88,7 +88,7 @@ build_sql_for_n_pinyin (GList* pylist,
 	/* always keep one space after current term */
 	GString* sql = NULL;
 	gchar* where_clause = NULL;
-	sql = g_string_new (NULL);
+	sql = g_string_new ("SELECT MAX(user_freq), phrase, MAX(freq) FROM (");
 	g_string_append_printf (
 		sql, "SELECT 0 AS user_freq, phrase, freq FROM "
 		"maindb.py_phrase_%u WHERE ", n - 1);
@@ -101,7 +101,7 @@ build_sql_for_n_pinyin (GList* pylist,
 		sql, "SELECT user_freq, phrase, freq FROM "
 		"userdb.py_phrase_%u WHERE ", n - 1);
 	sql = g_string_append (sql, where_clause);
-	sql = g_string_append (sql, "GROUP BY phrase ORDER BY user_freq DESC, freq DESC ");
+	sql = g_string_append (sql, ") GROUP BY phrase ORDER BY user_freq DESC, freq DESC ");
 	g_string_append_printf (sql, "LIMIT %u;", limit);
 	char* result = sql->str;
 	g_free (where_clause);