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Tables: heading and body Primary keys and entity integrity rule Foreign keys, referential integrity rule, and matching values Visualizing referential integrity constraints Relational Model representation of 1-M relationships, M-N relationships, and selfreferencing relationships Actions on referenced rows: cascade, nullify, restrict, default Subset operators: restrict (select) and project Join operator for combining two tables using a matching condition to compare join columns Natural join using equality for the matching operator, join columns with the same un qualified name, and elimination of one join column Most widely used operator for combining tables: natural join Less widely used operators for combining tables: full outer join, one-sided outer join, divide Outer join operator extending the join operator by preserving nonmatching rows One-sided outer join preserving the nonmatching rows of one input table Full outer join preserving the nonmatching rows of both input tables Traditional set operators: union, intersection, difference, extended cross product
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Union compatibility for comparing rows for the union, intersection, and difference operators Complex matching operator: divide operator for matching on a subset of rows Summarize operator that replaces groups of rows with summary rows
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How is creating a table similar to writing a chapter of a book 2 With what terminology for relational databases are you most comfortable Why
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3 What is the difference between a primary key and a candidate key 4 What is the difference between a candidate key and a superkey
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5 What is a null value 6 What is the motivation for the entity integrity rule 7 What is the motivation for the referential integrity rule 8 What is the relationship between the referential integrity rule and foreign keys 9 How are candidate keys that are not primary keys indicated in the CREATE TABLE statement 10 What is the advantage of using constraint names when defining primary key, candidate key, or referential integrity constraints in CREATE TABLE statements 11 When is it not permissible for foreign keys to store null values 12 What is the purpose of a database diagram such as the Access Relationship window 13 How is a 1-M relationship represented in the Relational Model 14 How is an M-N relationship represented in the Relational Model 15 What is a self-referencing relationship 16 How is a self-referencing relationship represented in the Relational Model 17 What is a referenced row 18 What two actions on referenced rows can affect related rows in a child table 19 What are the possible actions on related rows after a referenced row is deleted or its primary key is updated 20 Why is the restrict action for referenced rows more common than the cascade action 21 When is the nullify action not allowed 22 Why study the operators of relational algebra 23 Why are the restrict and the project operators widely used 24 Explain how the union, intersection, and difference operators for tables differ from the traditional' operators for sets 25 Why is the join operator so important for retrieving useful information 26 What is the relationship between the join and the extended cross product operators 27 Why is the extended cross product operator used sparingly 28 What happens to unmatched rows with the join operator 29 What happens to unmatched rows with the full outer join operator 30 What is the difference between the full outer join and the one-sided outer join 31 Define a decision-making situation that might require the summarize operator 32 What is an aggregate function 33 How are grouping columns used in the summarize operator 34 Why is the divide operator not as widely used as the join operator 35 What are the requirements of union compatibility 36 What are the requirements of the natural join operator 37 Why is the natural join operator widely used for combining tables 38 How do visual tools such as the Microsoft Access Query Design tool facilitate the formulation of join operations
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