The ProcBench schema is an augmented TPC-DS schema with 7 new fact tables namely store_sales_history, catalog_sales_history, web_sales_history, store_returns_history, catalog_returns_history, web_returns_history and inventory_history to store historical sales and returns data. The attributes of these history tables are identical to their nonhistory counterparts from the original schema. 

The create table statements for these additional fact tables are given below.

Note that Primary key and unique constraints are not needed for history tables because these constraints are already specified in the non-history tables; and the history tables only undergo bulk insertions from their non-history counterparts(details in the paper).

Storing data in the history and non-history tables : We recommend loading all TPC-DS data directly into the history fact tables. After this, one can use the '[insert into .. (select .. from .. where..)]' SQL statement to load the most recent 1 year data from the history tables to their non-history counterparts. The predicates in the `where` clause should be chosen depending on how many years' data one wants to store in the non-history tables.    

create table store_sales_history
(
    ss_sold_date_sk           integer                       ,
    ss_sold_time_sk           integer                       ,
    ss_item_sk                integer               		,
    ss_customer_sk            integer                       ,
    ss_cdemo_sk               integer                       ,
    ss_hdemo_sk               integer                       ,
    ss_addr_sk                integer                       ,
    ss_store_sk               integer                       ,
    ss_promo_sk               integer                       ,
    ss_ticket_number          integer               		,
    ss_quantity               integer                       ,
    ss_wholesale_cost         decimal(7,2)                  ,
    ss_list_price             decimal(7,2)                  ,
    ss_sales_price            decimal(7,2)                  ,
    ss_ext_discount_amt       decimal(7,2)                  ,
    ss_ext_sales_price        decimal(7,2)                  ,
    ss_ext_wholesale_cost     decimal(7,2)                  ,
    ss_ext_list_price         decimal(7,2)                  ,
    ss_ext_tax                decimal(7,2)                  ,
    ss_coupon_amt             decimal(7,2)                  ,
    ss_net_paid               decimal(7,2)                  ,
    ss_net_paid_inc_tax       decimal(7,2)                  ,
    ss_net_profit             decimal(7,2)                 
);

create table store_returns_history
(
    sr_returned_date_sk       integer                       ,
    sr_return_time_sk         integer                       ,
    sr_item_sk                integer               		,
    sr_customer_sk            integer                       ,
    sr_cdemo_sk               integer                       ,
    sr_hdemo_sk               integer                       ,
    sr_addr_sk                integer                       ,
    sr_store_sk               integer                       ,
    sr_reason_sk              integer                       ,
    sr_ticket_number          integer               		,
    sr_return_quantity        integer                       ,
    sr_return_amt             decimal(7,2)                  ,
    sr_return_tax             decimal(7,2)                  ,
    sr_return_amt_inc_tax     decimal(7,2)                  ,
    sr_fee                    decimal(7,2)                  ,
    sr_return_ship_cost       decimal(7,2)                  ,
    sr_refunded_cash          decimal(7,2)                  ,
    sr_reversed_charge        decimal(7,2)                  ,
    sr_store_credit           decimal(7,2)                  ,
    sr_net_loss               decimal(7,2)                  
);

create table catalog_sales_history
(
    cs_sold_date_sk           integer                       ,
    cs_sold_time_sk           integer                       ,
    cs_ship_date_sk           integer                       ,
    cs_bill_customer_sk       integer                       ,
    cs_bill_cdemo_sk          integer                       ,
    cs_bill_hdemo_sk          integer                       ,
    cs_bill_addr_sk           integer                       ,
    cs_ship_customer_sk       integer                       ,
    cs_ship_cdemo_sk          integer                       ,
    cs_ship_hdemo_sk          integer                       ,
    cs_ship_addr_sk           integer                       ,
    cs_call_center_sk         integer                       ,
    cs_catalog_page_sk        integer                       ,
    cs_ship_mode_sk           integer                       ,
    cs_warehouse_sk           integer                       ,
    cs_item_sk                integer               		,
    cs_promo_sk               integer                       ,
    cs_order_number           integer               		,
    cs_quantity               integer                       ,
    cs_wholesale_cost         decimal(7,2)                  ,
    cs_list_price             decimal(7,2)                  ,
    cs_sales_price            decimal(7,2)                  ,
    cs_ext_discount_amt       decimal(7,2)                  ,
    cs_ext_sales_price        decimal(7,2)                  ,
    cs_ext_wholesale_cost     decimal(7,2)                  ,
    cs_ext_list_price         decimal(7,2)                  ,
    cs_ext_tax                decimal(7,2)                  ,
    cs_coupon_amt             decimal(7,2)                  ,
    cs_ext_ship_cost          decimal(7,2)                  ,
    cs_net_paid               decimal(7,2)                  ,
    cs_net_paid_inc_tax       decimal(7,2)                  ,
    cs_net_paid_inc_ship      decimal(7,2)                  ,
    cs_net_paid_inc_ship_tax  decimal(7,2)                  ,
    cs_net_profit             decimal(7,2)                  
);

create table catalog_returns_history
(
    cr_returned_date_sk       integer                       ,
    cr_returned_time_sk       integer                       ,
    cr_item_sk                integer               		,
    cr_refunded_customer_sk   integer                       ,
    cr_refunded_cdemo_sk      integer                       ,
    cr_refunded_hdemo_sk      integer                       ,
    cr_refunded_addr_sk       integer                       ,
    cr_returning_customer_sk  integer                       ,
    cr_returning_cdemo_sk     integer                       ,
    cr_returning_hdemo_sk     integer                       ,
    cr_returning_addr_sk      integer                       ,
    cr_call_center_sk         integer                       ,
    cr_catalog_page_sk        integer                       ,
    cr_ship_mode_sk           integer                       ,
    cr_warehouse_sk           integer                       ,
    cr_reason_sk              integer                       ,
    cr_order_number           integer               		,
    cr_return_quantity        integer                       ,
    cr_return_amount          decimal(7,2)                  ,
    cr_return_tax             decimal(7,2)                  ,
    cr_return_amt_inc_tax     decimal(7,2)                  ,
    cr_fee                    decimal(7,2)                  ,
    cr_return_ship_cost       decimal(7,2)                  ,
    cr_refunded_cash          decimal(7,2)                  ,
    cr_reversed_charge        decimal(7,2)                  ,
    cr_store_credit           decimal(7,2)                  ,
    cr_net_loss               decimal(7,2)                  
);

create table web_sales_history
(
    ws_sold_date_sk           integer                       ,
    ws_sold_time_sk           integer                       ,
    ws_ship_date_sk           integer                       ,
    ws_item_sk                integer               		,
    ws_bill_customer_sk       integer                       ,
    ws_bill_cdemo_sk          integer                       ,
    ws_bill_hdemo_sk          integer                       ,
    ws_bill_addr_sk           integer                       ,
    ws_ship_customer_sk       integer                       ,
    ws_ship_cdemo_sk          integer                       ,
    ws_ship_hdemo_sk          integer                       ,
    ws_ship_addr_sk           integer                       ,
    ws_web_page_sk            integer                       ,
    ws_web_site_sk            integer                       ,
    ws_ship_mode_sk           integer                       ,
    ws_warehouse_sk           integer                       ,
    ws_promo_sk               integer                       ,
    ws_order_number           integer               		,
    ws_quantity               integer                       ,
    ws_wholesale_cost         decimal(7,2)                  ,
    ws_list_price             decimal(7,2)                  ,
    ws_sales_price            decimal(7,2)                  ,
    ws_ext_discount_amt       decimal(7,2)                  ,
    ws_ext_sales_price        decimal(7,2)                  ,
    ws_ext_wholesale_cost     decimal(7,2)                  ,
    ws_ext_list_price         decimal(7,2)                  ,
    ws_ext_tax                decimal(7,2)                  ,
    ws_coupon_amt             decimal(7,2)                  ,
    ws_ext_ship_cost          decimal(7,2)                  ,
    ws_net_paid               decimal(7,2)                  ,
    ws_net_paid_inc_tax       decimal(7,2)                  ,
    ws_net_paid_inc_ship      decimal(7,2)                  ,
    ws_net_paid_inc_ship_tax  decimal(7,2)                  ,
    ws_net_profit             decimal(7,2)                  				
);

create table web_returns_history
(
    wr_returned_date_sk       integer                       ,
    wr_returned_time_sk       integer                       ,
    wr_item_sk                integer               		,
    wr_refunded_customer_sk   integer                       ,
    wr_refunded_cdemo_sk      integer                       ,
    wr_refunded_hdemo_sk      integer                       ,
    wr_refunded_addr_sk       integer                       ,
    wr_returning_customer_sk  integer                       ,
    wr_returning_cdemo_sk     integer                       ,
    wr_returning_hdemo_sk     integer                       ,
    wr_returning_addr_sk      integer                       ,
    wr_web_page_sk            integer                       ,
    wr_reason_sk              integer                       ,
    wr_order_number           integer               		,
    wr_return_quantity        integer                       ,
    wr_return_amt             decimal(7,2)                  ,
    wr_return_tax             decimal(7,2)                  ,
    wr_return_amt_inc_tax     decimal(7,2)                  ,
    wr_fee                    decimal(7,2)                  ,
    wr_return_ship_cost       decimal(7,2)                  ,
    wr_refunded_cash          decimal(7,2)                  ,
    wr_reversed_charge        decimal(7,2)                  ,
    wr_account_credit         decimal(7,2)                  ,
    wr_net_loss               decimal(7,2)                 
);

create table inventory_history
(
    inv_date_sk               integer               		,
    inv_item_sk               integer               		,
    inv_warehouse_sk          integer               		, 
    inv_quantity_on_hand      integer                      
);
