diff --git a/lib/cartodb/utils/query-utils.js b/lib/cartodb/utils/query-utils.js
index e4bd67d3..238a905d 100644
--- a/lib/cartodb/utils/query-utils.js
+++ b/lib/cartodb/utils/query-utils.js
@@ -81,10 +81,10 @@ module.exports.getQueryTopCategories = function(query, column, topN, includeNull
         GROUP BY ${column} ORDER BY 2 DESC
         LIMIT ${topN}
     `;
-}
+};
 
 module.exports.getQueryActualRowCount = function (query) {
-    return 'select COUNT(*) AS rows FROM (${query}) AS __cdb_query';
+    return `select COUNT(*) AS rows FROM (${query}) AS __cdb_query`;
 };
 
 
@@ -101,11 +101,9 @@ module.exports.getQuerySample = function(query, sampleProb, randomSeed = 0.5) {
             FROM (${query}) AS __cdb_query
             WHERE random() < $
     `;
-    q = `WITH _rndseed as (SELECT setseed(0.5))
-    SELECT * FROM (${this._source._query}) as _cdb_query_wrapper WHERE random() < ${sampleProb};`;
 };
 
-module.exports.getTableSample = function(table, sampleProb, randomSeed) {
+function getTableSample(table, sampleProb, randomSeed) {
     sampleProb *= 100;
     randomSeed *= Math.pow(2, 31) -1;
     return `
@@ -129,8 +127,8 @@ function simpleQueryTable(sql) {
         match = sql.match(wrappedQuery);
     }
     if (match) {
-        schema = match[2];
-        table  = match[3];
+        const schema = match[2];
+        const table  = match[3];
         return schema ? `${schema}.${table}` : table;
     }
     return false;