diff --git a/internal/repository/request.go b/internal/repository/request.go
index 3ccd7e0..cd22d00 100644
--- a/internal/repository/request.go
+++ b/internal/repository/request.go
@@ -153,30 +153,33 @@ func (r *requestRepository) GetByID(ctx context.Context, id uuid.UUID) (*model.R
 }
 
 func (r *requestRepository) GetDetailByID(ctx context.Context, id uuid.UUID) (*model.RequestDetail, error) {
-	sqlQuery := `
-		SELECT 
-			r.id AS request_id,
-			r.request_txt AS title,
-			r.final_update_tz AS mail_text,
-			COALESCE(json_agg(
-				json_build_object(
-					'email', COALESCE(s.email, ''),
-					'phone', COALESCE(s.phone, ''),
-					'company_name', COALESCE(s.name, ''),
-					'company_id', s.id,
-					'url', COALESCE(s.url, '')
-				)
-			) FILTER (WHERE s.id IS NOT NULL), '[]') AS suppliers
-		FROM requests_for_suppliers r
-		LEFT JOIN suppliers s ON s.request_id = r.id
-		WHERE r.id = $1
-		GROUP BY r.id, r.request_txt, r.final_update_tz
-	`
+	query := r.qb.Select(
+		"r.id AS request_id",
+		"r.request_txt AS title",
+		"r.final_update_tz AS mail_text",
+		`COALESCE(json_agg(
+			json_build_object(
+				'email', COALESCE(s.email, ''),
+				'phone', COALESCE(s.phone, ''),
+				'company_name', COALESCE(s.name, ''),
+				'company_id', s.id,
+				'url', COALESCE(s.url, '')
+			)
+		) FILTER (WHERE s.id IS NOT NULL), '[]') AS suppliers`,
+	).From("requests_for_suppliers r").
+		LeftJoin("suppliers s ON s.request_id = r.id").
+		Where(sq.Eq{"r.id": id}).
+		GroupBy("r.id", "r.request_txt", "r.final_update_tz")
+
+	sqlQuery, args, err := query.ToSql()
+	if err != nil {
+		return nil, errs.NewInternalError(errs.DatabaseError, "failed to build query", err)
+	}
 
 	detail := &model.RequestDetail{}
 	var suppliersJSON []byte
 
-	err := r.pool.QueryRow(ctx, sqlQuery, id).Scan(
+	err = r.pool.QueryRow(ctx, sqlQuery, args...).Scan(
 		&detail.RequestID, &detail.Title, &detail.MailText, &suppliersJSON,
 	)
 
@@ -197,17 +200,20 @@ func (r *requestRepository) GetDetailByID(ctx context.Context, id uuid.UUID) (*m
 }
 
 func (r *requestRepository) GetUserStatistics(ctx context.Context, userID int) (requestsCount, suppliersCount, createdTZ int, err error) {
-	sqlQuery := `
-		SELECT 
-			COUNT(DISTINCT r.id) AS requests_count,
-			COUNT(s.id) AS suppliers_count,
-			COUNT(r.request_txt) AS created_tz
-		FROM requests_for_suppliers r
-		LEFT JOIN suppliers s ON s.request_id = r.id
-		WHERE r.user_id = $1
-	`
+	query := r.qb.Select(
+		"COUNT(DISTINCT r.id) AS requests_count",
+		"COUNT(s.id) AS suppliers_count",
+		"COUNT(DISTINCT CASE WHEN r.request_txt IS NOT NULL THEN r.id END) AS created_tz",
+	).From("requests_for_suppliers r").
+		LeftJoin("suppliers s ON s.request_id = r.id").
+		Where(sq.Eq{"r.user_id": userID})
 
-	err = r.pool.QueryRow(ctx, sqlQuery, userID).Scan(&requestsCount, &suppliersCount, &createdTZ)
+	sqlQuery, args, err := query.ToSql()
+	if err != nil {
+		return 0, 0, 0, errs.NewInternalError(errs.DatabaseError, "failed to build query", err)
+	}
+
+	err = r.pool.QueryRow(ctx, sqlQuery, args...).Scan(&requestsCount, &suppliersCount, &createdTZ)
 	if err != nil {
 		return 0, 0, 0, errs.NewInternalError(errs.DatabaseError, "failed to get statistics", err)
 	}