Merge pull request #280 from MCKanpolat/master

GetStatistics sql command fix

Author: azygis

src/Hangfire.PostgreSql/PostgreSqlMonitoringApi.cs

@@ -292,20 +292,20 @@ SELECT COUNT(*)
           FROM ""{_storage.Options.SchemaName}"".""server"";
 
           SELECT SUM(""value"") FROM
-            (SELECT SUM(""value"") value
+            (SELECT SUM(""value"") AS value
             FROM ""{_storage.Options.SchemaName}"".""counter"" 
             WHERE ""key"" = 'stats:succeeded'
             UNION ALL
-            SELECT SUM(""value"") value
+            SELECT SUM(""value"") AS value
             FROM ""{_storage.Options.SchemaName}"".""aggregatedcounter"" 
             WHERE ""key"" = 'stats:succeeded') c;
 
           SELECT SUM(""value"") FROM
-            (SELECT SUM(""value"") value
+            (SELECT SUM(""value"") AS value
             FROM ""{_storage.Options.SchemaName}"".""counter"" 
             WHERE ""key"" = 'stats:deleted'
             UNION ALL
-            SELECT SUM(""value"") value
+            SELECT SUM(""value"") AS value
             FROM ""{_storage.Options.SchemaName}"".""aggregatedcounter"" 
             WHERE ""key"" = 'stats:deleted') c;