diff --git a/aggregation.go b/aggregation.go
index 3df93e5..f634e8f 100644
--- a/aggregation.go
+++ b/aggregation.go
@@ -7,10 +7,13 @@ import (
 )
 
 type Aggregation struct {
-	Id               int             `json:"id"`
-	Interval         int             `json:"interval"`
-	Product          string          `json:"product"`
-	Price            decimal.Decimal `json:"price"`
+	Id               int    `json:"id"`
+	Interval         int    `json:"interval"`
+	Product          string `json:"product"`
+	OpenningPrice    decimal.Decimal
+	Price            decimal.Decimal
+	LowPrice         decimal.Decimal
+	HighPrice        decimal.Decimal
 	BuyVolume        decimal.Decimal `json:"buy_volume"`
 	SellVolume       decimal.Decimal `json:"sell_volume"`
 	BuyTransactions  int             `json:"buy_transactions"`
diff --git a/postgres/trade_service.go b/postgres/trade_service.go
index 4081201..03c0817 100644
--- a/postgres/trade_service.go
+++ b/postgres/trade_service.go
@@ -17,7 +17,8 @@ const (
 		`WHERE trade_id = $1 AND product = $2;`
 	trade_delete        = `DELETE FROM trades WHERE id = $1;`
 	trade_in_date_range = `SELECT id, ` + trade_columns + ` FROM ` +
-		`trades WHERE product = $1 AND timestamp >= $2 AND timestamp < $3;`
+		`trades WHERE product = $1 AND timestamp >= $2 AND timestamp < $3 ` +
+		`ORDER BY timestamp ASC;`
 	trade_first = `SELECT id, ` + trade_columns + ` FROM trades WHERE ` +
 		`product = $1 ORDER BY trade_id ASC LIMIT $2;`
 	trade_last = `SELECT id, ` + trade_columns + ` FROM trades WHERE ` +
@@ -29,7 +30,7 @@ const (
 	trade_product   = `SELECT DISTINCT product FROM trades;`
 	trade_after_all = `SELECT id, ` + trade_columns + ` FROM trades WHERE product = $1 ` +
 		`AND trade_id > $2 ORDER BY trade_id ASC;`
-	trade_where = `SELECT id, ` + trade_columns + ` FROM trades WHERE`
+	trade_where = `SELECT id, ` + trade_columns + ` FROM trades WHERE `
 )
 
 type TradeService struct {