Commit `6cdd053ccb`

6cdd053ccbafe5c479ae379448a85569bccdf19d

Unsigned

cmc <hello@cleberg.net> · 2023-06-16 21:43 UTC

add basic sqlite3 analysis script

Layout: unified · split

projects/sqlite3-analysis/README.md added +26

		@@ -0,0 +1,26 @@
	1	## Instructions
	2
	3	```bash
	4	# Open the database:
	5	sqlite3 ./chinook.db
	6	```
	7
	8	```sql
	9	# Enable some features and export the CSV results of the script
	10	.headers on
	11	.mode csv
	12	.output /home/cmc/git/data-science/projects/sql-dashboard/employee_sales.csv
	13	.read employee_sales.sql
	14	```
	15
	16	```bash
	17	# Inspect the results
	18	cat ./employee_sales.csv
	19	```
	20
	21	```csv
	22	EmployeeId,LastName,FirstName,Title,CustomerId,SupportRepId,State,Country,InvoiceId,CustomerId,InvoiceDate,InvoiceId,UnitPrice,Quantity,TotalPrice
	23	3,Peacock,Jane,"Sales Support Agent",1,3,SP,Brazil,98,1,"2010-03-11 00:00:00",98,1.99,1,1.99
	24	4,Park,Margaret,"Sales Support Agent",4,4,,Norway,2,4,"2009-01-02 00:00:00",2,0.99,1,0.99
	25	5,Johnson,Steve,"Sales Support Agent",2,5,,Germany,1,2,"2009-01-01 00:00:00",1,0.99,1,0.99
	26	```

projects/sqlite3-analysis/chinook.db added

Binary file not shown.

projects/sqlite3-analysis/employee_sales.csv added +4

		@@ -0,0 +1,4 @@
	1	EmployeeId,LastName,FirstName,Title,CustomerId,SupportRepId,State,Country,InvoiceId,CustomerId,InvoiceDate,InvoiceId,UnitPrice,Quantity,TotalPrice
	2	3,Peacock,Jane,"Sales Support Agent",1,3,SP,Brazil,98,1,"2010-03-11 00:00:00",98,1.99,1,1.99
	3	4,Park,Margaret,"Sales Support Agent",4,4,,Norway,2,4,"2009-01-02 00:00:00",2,0.99,1,0.99
	4	5,Johnson,Steve,"Sales Support Agent",2,5,,Germany,1,2,"2009-01-01 00:00:00",1,0.99,1,0.99

projects/sqlite3-analysis/employee_sales.sql added +49

		@@ -0,0 +1,49 @@
	1	-- Data ETL business script in sqlite3
	2
	3	-- Create new field(s) for business-requested calculations
	4	ALTER TABLE invoice_items
	5	ADD COLUMN TotalPrice
	6	GENERATED ALWAYS AS (UnitPrice * Quantity);
	7
	8	-- Extract and summarize data to show sales totals per employee
	9	WITH cst AS (
	10	SELECT
	11	CustomerId
	12	,SupportRepId
	13	,State
	14	,Country
	15	FROM customers
	16	),
	17	emp AS (
	18	SELECT
	19	EmployeeId
	20	,LastName
	21	,FirstName
	22	,Title
	23	FROM employees
	24	),
	25	inv AS (
	26	SELECT
	27	InvoiceId
	28	,CustomerId
	29	,InvoiceDate
	30	FROM invoices
	31	),
	32	tot AS (
	33	SELECT
	34	InvoiceId
	35	,UnitPrice
	36	,Quantity
	37	,TotalPrice
	38	FROM invoice_items
	39	)
	40
	41	SELECT DISTINCT * FROM emp
	42	LEFT JOIN cst ON emp.EmployeeId = cst.SupportRepId
	43	LEFT JOIN inv ON cst.CustomerId = inv.CustomerId
	44	LEFT JOIN tot ON inv.InvoiceId = tot.InvoiceId
	45	WHERE inv.InvoiceDate <= date()
	46	GROUP BY EmployeeId;
	47
	48	-- Drop col used for calculations
	49	ALTER TABLE invoice_items DROP TotalPrice;

Commit 6cdd053ccb