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Querying Daton created tables on RedShift

How to query RedShift tables

Querying Daton created tables on RedShift

RedShift data warehouse does not support nested tables. Hence, Daton creates separate 'child' tables for each nested data present in source schema(or parent table).

At present Daton creates separate child tables up to three levels.

For example, if data is present in Listrecommendations.Fulfillmentrecommendations.Member.Itemdimensions.Dimensiondescriptionthen the following tables would be created -
  1. 1.
    Listrecommendations (Parent Table)
  2. 2.
    Listrecommendations_Fulfillmentrecommendations (Level 1 Child)
  3. 3.
    Listrecommendations_Fulfillmentrecommendations_Member (Level 2 Child)
  4. 4.
    Listrecommendations_Fulfillmentrecommendations_Member_Itemdimensions (Level 3 Child)
Any nested data present in Itemdimesions would be stored at text and any excess data which does not fit into that field would be truncated.

Data Mapping

Data between parent and child tables can be mapped or combined using daton_parent_batch_id and daton_batch_runtime meta fields. The same applies for other levels of child tables.
For example, if API response for ListOrderItems contains data in the following structure
Column Name
Datatype
AmazonOrderId
STRING
ASIN
STRING
SellerSKU
STRING
OrderItemId
STRING
ItemPrice
RECORD
ItemPrice.CurrencyCode
STRING
ItemPrice.Amount
STRING
then the following tables would be created by Daton on RedShift
Table 1: ListOrderItem (Parent Table)
Column Name
Datatype
AmazonOrderId
STRING
ASIN
STRING
SellerSKU
STRING
OrderItemId
STRING
daton_user_id
NUMERIC
daton_batch_runtime
NUMERIC
daton_batch_id
NUMERIC
Table 2: ListOrderItem_ItemPrice (Level 1 Child Table)
Column Name
Datatype
CurrencyCode
STRING
Amount
STRING
daton_user_id
NUMERIC
daton_batch_runtime
NUMERIC
daton_batch_id
NUMERIC
daton_parent_batch_id
NUMERIC
In order to fetch Item price for an AmazonOrderId, daton_batch_id and daton_batch_runtime must be used for mapping records
select Amount from listorderitems_itemprice
where
daton_parent_batch_id = (select daton_batch_id from mws_listorderitems where amazonorderid = 'XXX-7370285-XXXX')
and
daton_batch_runtime = (select daton_batch_runtime from mws_listorderitems where amazonorderid = 'XXX-7370285-XXXX')