Update README.md

Antonio Penta · web-flow · commit d4c73b1446c1 · 2018-06-29T13:33:39.000+02:00
change readme
diff --git a/README.md b/README.md
@@ -20,4 +20,5 @@ It is a folder with all the data, and the backup of the database, that can be im
 
 * SQLPrimer.pdf
 It is a presentation used to explain SQL operators like join, cartesian product, group by, having, select * from * where *.
+Some examples have been taken from http://web.stanford.edu/class/cs145/
 

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`@@ -20,4 +20,5 @@ It is a folder with all the data, and the backup of the database, that can be im`
`20`	`20`
`21`	`21`	`* SQLPrimer.pdf`
`22`	`22`	`It is a presentation used to explain SQL operators like join, cartesian product, group by, having, select * from * where *.`
	`23`	`+Some examples have been taken from http://web.stanford.edu/class/cs145/`
`23`	`24`