Workshop 2 – Joins, Subqueries, Unions, Calculations and Grouping

1. SQL200 SQL Programming Workshop 2 – Joins, Subqueries, Unions, Calculations and Grouping

2. SQL200 Contact Information P.O. Box 6142 Laguna Niguel, CA 92607 949-489-1472 http://www.d2associates.com [email_address] Copyright 2001-2009. All rights reserved.

3. SQL200 SQL Programming Part 1 – Joins, Subqueries

4. Relational Database with constraints (from text)

9. Inner Join Older Syntax: Select <column-list> From <tablelist> Where <predicate> Still very commonly used

10. Inner Join Example using older syntax: SELECT customer_first_name, customer_street, order_numb, order_date from customers, orders Where customers.customer_numb = orders.customer_numb

11. Inner Join with Result

12. Inner Join (New Syntax) Basic SQL 92 Syntax: Select <column-list> From <table1> Inner join <table2> On <join condition>

13. Inner Join Basic Example: SELECT customer_first_name, customer_street, order_numb, order_date from customers inner join orders on customers.customer_numb = orders.customer_numb

14. Inner Join with Result

16. Inner Join Result in MS Access

19. Cross Join Result Set in MS Access

23. Multi-table Join with Results

24. MS Access Multi-table Join Result Set

28. Self Joins SELECT e.*, m.name FROM employees AS e, employees AS m WHERE e.managerid = m.employeeid;

31. Left Outer Join Basic SQL 92 Syntax: Select <column-list> From <table1> Left join <table2> On <join condition>

32. Left-Join Basic Example: SELECT customer_first_name, customer_street, order_numb, order_date from customers as c left join orders as o on c.customer_numb = o.customer_numb

34. Left Join with Results

35. SQL200 SQL Programming Part 2– Subqueries, Unions

37. Uncorrelated Subquery select isbn, quantity from orderlines ol where ol.order_numb in (select o.order_numb from orders o where order_date between #1/1/99# and #12/31/99#)

38. Uncorrelated Subquery with Results

40. Negative Subquery select isbn, quantity from orderlines ol where ol.order_numb not in (select o.order_numb from orders o where order_date between #1/1/99# and #12/31/99#)

41. Negative Subquery with Results

43. Correlated subquery with Exists SELECT isbn, quantity FROM orderlines AS ol WHERE exists (select * from orders o where ol.order_numb = o.order_numb and o.order_date between #1/1/99# and #12/31/99#); This type of query covered in intermediate SQL class

45. Unions Select <column-list> from <table1> Union [ALL] Select <same-columns> from <table2>

46. Unions select * from employees union all select * from employees_copy

47. Results of Union query

48. SQL200 SQL Programming Part 3 – Calculations, Aggregates

50. Calculated field in the Result

54. Concatenation select customer_first_name & &quot; &quot; & trim(customer_last_name) as Name from customers

58. Aggregate Functions Basic syntax: Select <function>(<column>) From <table> Group by <column-list> Having <predicate> Group by all columns to left of one(s) you want to aggregate

59. Aggregate Functions SELECT orderlines.order_numb, Count(*) AS &quot;Number of Order Lines &quot;, Sum(orderlines.quantity) AS SumOfquantity, Sum([quantity]*[cost_each]) AS extension FROM orderlines GROUP BY orderlines.order_numb having count(*) > 1

63. Exercise Result [end module]