Deleting orders, sales & customers in magento

I had a website that had alot of old orders, customers & sales that I wanted to deleted and start over. I was having problem doing it via the admin area. This is when I took the database management approach and went in to delete the entire thing using a SQL query.  The following sql has been tested by me from 1.4.1 to 1.9.1.1 just liked my reference source did. So this is what I used:

SET FOREIGN_KEY_CHECKS=0;

##############################

# SALES RELATED TABLES

##############################

TRUNCATE sales_flat_creditmemo;

TRUNCATE sales_flat_creditmemo_comment;

TRUNCATE sales_flat_creditmemo_grid;

TRUNCATE sales_flat_creditmemo_item;

TRUNCATE sales_flat_invoice;

TRUNCATE sales_flat_invoice_comment;

TRUNCATE sales_flat_invoice_grid;

TRUNCATE sales_flat_invoice_item;

TRUNCATE sales_flat_order;

TRUNCATE sales_flat_order_address;

TRUNCATE sales_flat_order_grid;

TRUNCATE sales_flat_order_item;

TRUNCATE sales_flat_order_payment;

TRUNCATE sales_flat_order_status_history;

TRUNCATE sales_flat_quote;

TRUNCATE sales_flat_quote_address;

TRUNCATE sales_flat_quote_address_item;

TRUNCATE sales_flat_quote_item;

TRUNCATE sales_flat_quote_item_option;

TRUNCATE sales_flat_quote_payment;

TRUNCATE sales_flat_quote_shipping_rate;

TRUNCATE sales_flat_shipment;

TRUNCATE sales_flat_shipment_comment;

TRUNCATE sales_flat_shipment_grid;

TRUNCATE sales_flat_shipment_item;

TRUNCATE sales_flat_shipment_track;

TRUNCATE sales_invoiced_aggregated;            # ??

TRUNCATE sales_invoiced_aggregated_order;        # ??

TRUNCATE log_quote;

ALTER TABLE sales_flat_creditmemo_comment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_creditmemo_grid AUTO_INCREMENT=1;

ALTER TABLE sales_flat_creditmemo_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_invoice AUTO_INCREMENT=1;

ALTER TABLE sales_flat_invoice_comment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_invoice_grid AUTO_INCREMENT=1;

ALTER TABLE sales_flat_invoice_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order_address AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order_grid AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order_payment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_order_status_history AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_address AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_address_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_item_option AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_payment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_quote_shipping_rate AUTO_INCREMENT=1;

ALTER TABLE sales_flat_shipment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_shipment_comment AUTO_INCREMENT=1;

ALTER TABLE sales_flat_shipment_grid AUTO_INCREMENT=1;

ALTER TABLE sales_flat_shipment_item AUTO_INCREMENT=1;

ALTER TABLE sales_flat_shipment_track AUTO_INCREMENT=1;

ALTER TABLE sales_invoiced_aggregated AUTO_INCREMENT=1;

ALTER TABLE sales_invoiced_aggregated_order AUTO_INCREMENT=1;

ALTER TABLE log_quote AUTO_INCREMENT=1;

#########################################

# DOWNLOADABLE PURCHASED

#########################################

TRUNCATE downloadable_link_purchased;

TRUNCATE downloadable_link_purchased_item;

ALTER TABLE downloadable_link_purchased AUTO_INCREMENT=1;

ALTER TABLE downloadable_link_purchased_item AUTO_INCREMENT=1;

#########################################

# RESET ID COUNTERS

#########################################

TRUNCATE eav_entity_store;

ALTER TABLE  eav_entity_store AUTO_INCREMENT=1;

##############################

# CUSTOMER RELATED TABLES

##############################

TRUNCATE customer_address_entity;

TRUNCATE customer_address_entity_datetime;

TRUNCATE customer_address_entity_decimal;

TRUNCATE customer_address_entity_int;

TRUNCATE customer_address_entity_text;

TRUNCATE customer_address_entity_varchar;

TRUNCATE customer_entity;

TRUNCATE customer_entity_datetime;

TRUNCATE customer_entity_decimal;

TRUNCATE customer_entity_int;

TRUNCATE customer_entity_text;

TRUNCATE customer_entity_varchar;

TRUNCATE tag;

TRUNCATE tag_relation;

TRUNCATE tag_summary;

TRUNCATE tag_properties;            ## CHECK ME

TRUNCATE wishlist;

TRUNCATE log_customer;

ALTER TABLE customer_address_entity AUTO_INCREMENT=1;

ALTER TABLE customer_address_entity_datetime AUTO_INCREMENT=1;

ALTER TABLE customer_address_entity_decimal AUTO_INCREMENT=1;

ALTER TABLE customer_address_entity_int AUTO_INCREMENT=1;

ALTER TABLE customer_address_entity_text AUTO_INCREMENT=1;

ALTER TABLE customer_address_entity_varchar AUTO_INCREMENT=1;

ALTER TABLE customer_entity AUTO_INCREMENT=1;

ALTER TABLE customer_entity_datetime AUTO_INCREMENT=1;

ALTER TABLE customer_entity_decimal AUTO_INCREMENT=1;

ALTER TABLE customer_entity_int AUTO_INCREMENT=1;

ALTER TABLE customer_entity_text AUTO_INCREMENT=1;

ALTER TABLE customer_entity_varchar AUTO_INCREMENT=1;

ALTER TABLE tag AUTO_INCREMENT=1;

ALTER TABLE tag_relation AUTO_INCREMENT=1;

ALTER TABLE tag_summary AUTO_INCREMENT=1;

ALTER TABLE tag_properties AUTO_INCREMENT=1;

ALTER TABLE wishlist AUTO_INCREMENT=1;

ALTER TABLE log_customer AUTO_INCREMENT=1;

##############################

# ADDITIONAL LOGS

##############################

TRUNCATE log_url;

TRUNCATE log_url_info;

TRUNCATE log_visitor;

TRUNCATE log_visitor_info;

TRUNCATE report_event;

TRUNCATE report_viewed_product_index;

TRUNCATE sendfriend_log;

### ??? TRUNCATE log_summary

ALTER TABLE log_url AUTO_INCREMENT=1;

ALTER TABLE log_url_info AUTO_INCREMENT=1;

ALTER TABLE log_visitor AUTO_INCREMENT=1;

ALTER TABLE log_visitor_info AUTO_INCREMENT=1;

ALTER TABLE report_event AUTO_INCREMENT=1;

ALTER TABLE report_viewed_product_index AUTO_INCREMENT=1;

ALTER TABLE sendfriend_log AUTO_INCREMENT=1;

### ??? ALTER TABLE log_summary AUTO_INCREMENT=1;

SET FOREIGN_KEY_CHECKS=1;

References:

https://www.designhaven.co.uk/2014/08/cleanly-delete-orders-sales-customer-data-magento/