examstyle Thursday, 27 April 2017 2.00 pm – 3.30 pm (Duration: 1 hour 30 minutes) DEGREES of MSc in Information Technology, MSc in Software Development Database Theory and Applications (Answer All Questions) This examination paper is worth a total of 60 marks The use of a calculator is not permitted in this examination INSTRUCTIONS TO […]
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examstyle Wednesday 28 April 2018 2.00 pm – 3.30 pm (Duration: 1 hour 30 minutes) DEGREES OF MSc, MSci, MEng, BEng, BSc,MA and MA (Social Sciences) Database Theory and Applications M (Answer All Questions) This examination paper is worth a total of 60 marks The use of a calculator is not permitted in this examination
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Relational Algebra RELATIONAL ALGEBRA Database Theory & Applications (M) Dr Chris Anagnostopoulos ROADMAP Objective: explore what is inside a Database System …from what to do going to how to do List different strategies for SQL processing Relational Algebra Challenge: Transform SQL into Relational Expression Challenge: Transform Relational Expression into
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DTA(M) Database Theory & Applications Lab 1 Tasks: Solutions A proposed E-R diagram is provided: • Owner (Entity) of a dog has a name (Attribute) and contact details, e.g., phone number (Attribute). • Dog (Entity) has a name (Attribute), an owner (associated with the Entity Owner), a breed name (Attribute) and a kennel (Attribute). In
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DTA (M) Database Theory & Applications Lab 5 Tasks Task 1: Set up a Database Account 1.1 Connect with the PostgreSQL Server PostgreSQL system is a Client-Server system, i.e.: • Many databases, each having multiple tables, reside on a single machine. • This machine runs a server process, which manages all database access. • Other
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File Structures ADVANCED SQL & ANALYTICS Database Theory & Applications (M) Dr Chris Anagnostopoulos ROADMAP Join Query Dealing with NULL FKs Analytics Query Complex Un/Correlated Query using Aggregation Functions over Groups of Tuples; Objective: Extract knowledge from tuples and not just retrieving tuples… Modification Query 2 INNER JOIN
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DTA (M) Database Theory & Applications Lab 7 Tasks: Solutions Task 1: Advanced SQL SELECT Statements ‘Dog’ Database SQL1: SELECT O.OWNERID, O.NAME, COUNT(DISTINCT (K.KENNELNAME)) FROM OWNER AS O, DOG AS D, KENNEL AS K WHERE D.OWNERID = O.OWNERID AND D.KENNELNAME = K.KENNELNAME GROUP BY O.OWNERID ORDER BY O.NAME SQL2: SELECT * FROM DOG WHERE KENNELNAME
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Friday 26 April 2019 2.00 pm – 3.30 pm (Duration: 1 hour 30 minutes) DEGREES OF MSc, MSci, MEng, BEng, BSc,MA and MA (Social Sciences) Database Theory and Applications M (Answer All Questions) This examination paper is worth a total of 60 marks The use of a calculator is not permitted in this examination INSTRUCTIONS
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DTA (M) Database Theory & Applications Lab 6 Tasks: Solutions These are some proposed SQL SELECT statements. Surely, these are not unique; you can provide your own alternatives/versions of the same SQL query ☺. SQL SELECT Statements ‘Dog’ Database SQL 1: SELECT * FROM owner WHERE phone like ‘141%’ or phone IS NULL SQL 2:
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File Structures HEURISTIC QUERY OPTIMIZATION Database Theory & Applications (M) Dr Chris Anagnostopoulos ROADMAP Transformation of the canonical Tree to the optimal Tree Re-writing equivalent trees Heuristic inferential rules Examples Selection-Projection-Join Queries Aggregation Analytics Queries 2 HEURISTIC QUERY OPTIMIZATION Input: SQL query is issued by the user. Step
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