Free practice · Interactive SQL · easy

Practice

Summarize order volume and revenue

Return one row with COUNT(*) AS order_count and SUM(order_amount) AS total_revenue.

Practice database

US customer orders

Fictional customers, sales employees, and orders with USD amounts.

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Table relationships
employees.manager_idemployees.employee_idorders.customer_idcustomers.customer_idorders.sales_rep_idemployees.employee_id

customers

Customer profile fields used for account reporting.

6 rows

Grain One row per customer

  • customer_idTEXTPK
  • customer_nameTEXT
  • cityTEXT
  • state_codeTEXT
  • segmentTEXT
  • signup_dateTEXT
Preview source rows
customer_idcustomer_namecitystate_codesegmentsignup_date
C-101Northstar HealthAustinTXHealthcare2025-11-15
C-102Blue Ridge BooksRichmondVARetail2025-12-01
C-103Pacific Office WorksSan DiegoCAMidmarket2026-01-08

employees

Sales employees and their reporting relationships.

5 rows

Grain One row per employee

  • employee_idTEXTPK
  • employee_nameTEXT
  • regionTEXT
  • manager_idTEXTFK
Preview source rows
employee_idemployee_nameregionmanager_id
E-10Sam RiveraNationalNULL
E-11Taylor BrooksNationalNULL
E-01Ava PatelEastE-10

orders

Order-level dates, statuses, owners, and USD amounts.

7 rows

Grain One row per order

  • order_idTEXTPK
  • customer_idTEXTFK
  • order_dateTEXT
  • statusTEXT
  • sales_rep_idTEXTFK
  • order_amountREAL
Preview source rows
order_idcustomer_idorder_datestatussales_rep_idorder_amount
O-2001C-1012026-01-05ShippedE-011200
O-2002C-1022026-01-10ProcessingE-02800
O-2003C-1012026-02-02ShippedE-01450

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