Simple SQL Queries (2)

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1 Simple SQL Queries (2)

2 Review SQL the structured query language for relational databases DDL: data definition language DML: data manipulation language Create and maintain tables CMPT 354: Database I -- Simple SQL (2) 2

3 Retrieving Data from a Table What do you want to retrieve from a table? Some tuples (e.g., some customer records, some movies, ) Some attributes about the tuples (e.g., the age, the title, ) Query results are still (conceptual) tables Query results can be used as the sources of other queries A simple and consistent model of data processing CMPT 354: Database I -- Simple SQL (2) 3

4 Queries and Results Name Gender Occupation Age Arbor M Student 23 Bob M Teacher 34 Cindy F Student 18 Daisy F Lawyer 47 Eddy M Doctor 41 Frank M Student 19 Greg M Sales 27 Helen F Police 28 Jenny F Banker 46 CMPT 354: Database I -- Simple SQL (2) 4

5 Queries and Results Name Gender Occupation Age Arbor M Student 23 Bob M Teacher 34 Cindy F Student 18 Daisy F Lawyer 47 Eddy M Doctor 41 Frank M Student 19 Greg M Sales 27 Helen F Police 28 Jenny F Banker 46 CMPT 354: Database I -- Simple SQL (2) 5

6 Queries and Results Name Gender Occupation Age Arbor M Student 23 Bob M Teacher 34 Cindy F Student 18 Daisy F Lawyer 47 Eddy M Doctor 41 Frank M Student 19 Greg M Sales 27 Helen F Police 28 Jenny F Banker 46 Gender Age M 23 F 18 M 19 CMPT 354: Database I -- Simple SQL (2) 6

7 Query Specification Data sources Attributes required Tuples interesting The SELECT-FROM-WHERE structure in SQL The idea has been borrowed by some other query languages, such as XQuery CMPT 354: Database I -- Simple SQL (2) 7

8 Basic Query Structure A typical SQL query has the form select A1, A2,..., An from r1, r2,..., rm where P Ai represents an attribute Ri represents a relation P is a predicate, filtering out unwanted tuples The result of an SQL query is a table CMPT 354: Database I -- Simple SQL (2) 8

9 The SELECT Clause List the attributes desired in the result of a query Example: find the names of all branches in the loan relation: select branch_name from loan SQL names are case insensitive You may use upper- or lower-case letters CMPT 354: Database I -- Simple SQL (2) 9

10 Duplicates SQL allows duplicates in relations and in query results To force the elimination of duplicates, use the keyword distinct or unique after keyword select UNIQUE is not supported in SQL Server 2005 Find the names of all branches in the loan relations, and remove duplicates select distinct branch_name from loan The keyword all specifies that duplicates are not be removed select all branch_name from loan CMPT 354: Database I -- Simple SQL (2) 10

11 Selecting All Attributes and More An asterisk in the select clause select * from loan Arithmetic expressions involving the operation, +,,, and /, and operating on constants or attributes of tuples select loan_number, branch_name, amount * 100 from loan CMPT 354: Database I -- Simple SQL (2) 11

12 The WHERE Clause Specify conditions that the result tuples must satisfy select loan_number from loan where branch_name = Perryridge and amount > 1200 Comparison results can be combined using the logical connectives and, or, and not Comparisons can be applied to results of arithmetic expressions CMPT 354: Database I -- Simple SQL (2) 12

13 Predicate Between Find the loan number of those loans with loan amounts between $90,000 and $100,000 select loan_number from loan where amount between and CMPT 354: Database I -- Simple SQL (2) 13

14 The FROM Clause List the relations involved in the query Find the name, loan number and loan amount of all customers having a loan at the Perryridge branch select customer_name, borrower.loan_number, amount from borrower, loan where borrower.loan_number = loan.loan_number and branch_name = Perryridge Schema borrower (customer_name, loan_number) loan (loan_number, branch_name, amount) CMPT 354: Database I -- Simple SQL (2) 14

15 The Rename Operation Renaming relations and attributes using the as clause old-name as new-name Find the name, loan number and loan amount of all customers; rename the column name loan_number as loan_id select customer_name, borrower.loan_number as loan_id, amount from borrower, loan where borrower.loan_number = loan.loan_number CMPT 354: Database I -- Simple SQL (2) 15

16 Tuple Variables Defined in the from clause via the use of the as clause Find the customer names and their loan numbers for all customers having a loan at some branch select customer_name,t.loan_number,s.amount from borrower as T, loan as S where T.loan_number = S.loan_number from borrower as T, loan as S can be written as from borrower T, loan S in SQL Server CMPT 354: Database I -- Simple SQL (2) 16

17 Using One Table Twice in a Query Find the names of all branches that have greater assets than some branch located in Brooklyn select distinct T.branch_name from branch as T, branch as S where T.assets > S.assets and S.branch_city = Brooklyn CMPT 354: Database I -- Simple SQL (2) 17

18 String Operations The operator like uses patterns that are described using two special characters The % character matches any substring The _ character matches any character Find the names of all customers whose street includes the substring Main select customer_name from customer where customer_street like %Main% How to match the name Main%? like Main\% escape \ CMPT 354: Database I -- Simple SQL (2) 18

19 More on String Operations SQL supports a variety of string operations such as Concatenation (using ) Converting from upper to lower case (and vice versa) Finding string length, extracting substrings, etc. Check them out by yourself CMPT 354: Database I -- Simple SQL (2) 19

20 Ordering the Display of Tuples List in alphabetic order the names of all customers having a loan in Perryridge branch select distinct customer_name from borrower, loan where borrower loan_number = loan.loan_number and branch_name = Perryridge order by customer_name desc for descending order or asc for ascending order, for each attribute Ascending order is the default. Example: order by customer_name desc CMPT 354: Database I -- Simple SQL (2) 20

21 Set Operations The set operations union, intersect, and except operate on relations Each of the above operations automatically eliminates duplicates To retain all duplicates use union all, intersect all and except all Suppose a tuple occurs m times in r and n times in s m + n times in r union all s min(m,n) times in r intersect all s max(0, m n) times in r except all s CMPT 354: Database I -- Simple SQL (2) 21

22 Set Operations Examples Find all customers who have a loan, an account, or both (select customer_name from depositor) union (select customer_name from borrower) Find all customers who have both a loan and an account (select customer_name from depositor) intersect (select customer_name from borrower) Find all customers who have an account but no loan (select customer_name from depositor) except (select customer_name from borrower) CMPT 354: Database I -- Simple SQL (2) 22

23 Basic Aggregate Functions avg: average value min: minimum value max: maximum value sum: sum of values count: number of values CMPT 354: Database I -- Simple SQL (2) 23

24 Aggregate Functions Examples Find the average account balance at the Perryridge branch select avg (balance) from account where branch_name = Perryridge Find the number of tuples in the customer relation select count (*) from customer Find the number of depositors in the bank select count (distinct customer_name) from depositor CMPT 354: Database I -- Simple SQL (2) 24

25 Group By Apply an aggregate function to groups of tuples Each group returns an aggregate value Find the number of depositors for each branch select branch_name, count (distinct customer_name) from depositor, account where depositor.account_number = account.account_number group by branch_name Attributes in select clause outside of aggregate functions must appear in the group by list CMPT 354: Database I -- Simple SQL (2) 25

26 Having Clause Constraints on Groups Selecting groups Find the names of all branches where the average account balance is more than $1,200 select branch_name, avg (balance) from account group by branch_name having avg (balance) > 1200 Predicates in the having clause are applied after the formation of groups Predicates in the where clause are applied before forming groups CMPT 354: Database I -- Simple SQL (2) 26

27 Null Values Predicate is null can be used to check for null values Find all loan number which appear in the loan relation with null values for amount select loan_number from loan where amount is null The result of any arithmetic expression involving null is null Example: 5 + null returns null CMPT 354: Database I -- Simple SQL (2) 27

28 Null Values and 3 Valued Logic Any comparison with null returns unknown Example: 5 < null, null <> null, null = null Three-valued logic using the truth value unknown OR: (unknown or true) = true, (unknown or false) = unknown, (unknown or unknown) = unknown AND: (true and unknown) = unknown, (false and unknown) = false, (unknown and unknown) = unknown NOT: (not unknown) = unknown P is unknown evaluates to true if predicate P evaluates to unknown Result of where clause predicate is treated as false if it evaluates to unknown CMPT 354: Database I -- Simple SQL (2) 28

29 Null Values and Aggregates Total all loan amounts select sum (amount ) from loan Ignore null amounts Result is null if there is no non-null amount All aggregate operations except count(*) ignore tuples with null values on the aggregated attributes Count(*) counts the number of tuples, including those of null values Count(amount) counts the number of tuples of non-null values on amount CMPT 354: Database I -- Simple SQL (2) 29

30 Summary Basic SELECT-FROM-WHERE structure Selecting from multiple tables String operations Set operations Aggregate functions and group-by queries Null values CMPT 354: Database I -- Simple SQL (2) 30

31 To-Do List Check out the string operations available in SQL Server 2005 Use the pubs database, write the following queries, and run them on SQL Server List all titles and the number of authors of each title For each author, find the most expensive title of the author Find all cities and states where there is an author or a publisher CMPT 354: Database I -- Simple SQL (2) 31

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