SQL 2: Query SQL 2.1: SELECT Jianjun Contents The next three lectures will cover a good portion of “Data manipulation language (DML)” of RDBMS. SELECT: Overview SELECT [DISTINCT | ALL] column-list FROM table-names [WHERE condition] [ORDER BY column-list] [GROUP BY column-list] [HAVING condition] Examples in This Lecture SELECT In its simplest form, SELECT is the […]
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Boyce-Codd normal form Boyce-Codd Normal Form Jianjun Chen Previous Lecture In the previous lecture we demonstrated how 2NF and 3NF disallow partial and transitive dependencies on the primary key of a relation, respectively. Relations that have these types of dependencies may suffer from the update anomalies In This Lecture More normalisation Lossless decomposition Boyce-Codd normal
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Review of the Asymptotic Notation Egan fcn qgcn I A myquadratic function is any I Any lenien x x 0C n’I E Any Cubic x x 0 n gon fat Scgins No I Anyquadratifunctionisorce E Any denim a AH I Any Cubic x x 242 flakolgen Any quadraticfunction isoti E Any linear v OM E
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PattPatelCh19.ppt Chapter 19 Data Structures Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 19-2 Data Structures A data structure is a particular organization of data in memory. • We want to group related items together. • We want to organize these data bundles in a way that is convenient to program
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PattPatelCh19.ppt Chapter 19 Data Structures Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display. 19-2 Data Structures A data structure is a particular organization of data in memory. • We want to group related items together. • We want to organize these data bundles in a way that is convenient to program
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Tutorial Week 9-10 PL/SQL Advance Today we are going to do some simple exercises involving PL/SQL. It is a programming language for Oracle Database that allows you to do much more complex things than SQL itself. We are going to use HR database. Exercise 1 Create and execute a simple anonymous block that outputs “Hello
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Week 10: PL/SQL Advanced Solution This time we are again going to use HR database for answering following questions Procedure a) Modify the following to a procedure. Execute and invoke the procedure. Then Drop the procedure. DECLARE v_dept_name departments.department_name%TYPE:= ‘Education’; v_dept_id NUMBER; v_max_deptno NUMBER; BEGIN SELECT MAX(department_id) INTO v_max_deptno FROM departments; DBMS_OUTPUT.PUT_LINE(‘The maximum department_id is
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CS 450 Homework 3 Carl Offner Fall 2021 Due Friday, October 1, 11:30 PM This assignment uses the functional aspects of Scheme to construct a relatively simple but non-trivial program. Once you have finished this assignment you will have a good command of the functional style. I will collect two files from your hw3 directory:
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Microsoft PowerPoint – lectureweek7 (1).pptx PLSQL Basics II KIT712 Announcements • Test 2: SQL Queries and Optimisations after midsemester break • Lectures (SQL Queries, Database Security ,SQL Optimisations) • Tutorial (SQL Queries and SQL Optimisation) • Question Types & Duration will be sent by email • Mock test will be available by Mylo • Will be using livesql website. • Marks for assignment and Test 1 will be finalised by this Friday. General comments will be
SQL Injection KIT712: SQL Tuning II Adapted from Oracle SQL Optimisation Training Slides) * Why to tune your sql? Which scenario is worse? SQL Statement 1 Executed 100 times Caused 100 minutes of wait time for end user Waited 99% of time on “db file sequential read” SQL Statement 2 Executed 1 time Caused 100
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