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SQL: A Beginner s Guide
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4: Enforcing Data Integrity
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1. What are the three categories of integrity constraints Table-related constraints (sometimes referred to simply as table constraints), assertions, and domain constraints 2. What are the differences between a column constraint and a table constraint Both types of constraints are defined in the table definition. A column constraint is included with the column definition, and a table constraint is included as a table element, similar to the way columns are defined as table elements. 3. What types of constraints can you include in a column definition NOT NULL, UNIQUE, PRIMARY KEY, FOREIGN KEY, and CHECK 4. What is the difference between a table constraint and an assertion A table constraint is defined within a table definition and applies only to that table. An assertion is a type of constraint that is defined within an assertion definition (separate from the table definition). An assertion can be associated with one or more tables. 5. What does a null value signify A null signifies that a value is undefined or not known. This is not the same as a zero, a blank, or a default value. Instead, it indicates that a data value is absent. 6. Which of the following types of constraints support NOT NULL constraints A. Table constraints B. Column constraints C. Domain constraints D. Assertions B is the correct answer. 7. You are creating a table that includes a column that allows null values but whose non-null values should be unique. Which type of constraint should you use UNIQUE 8. You re creating a table that includes the TYPE_NAME column. The column is defined with the CHAR(10) data type and requires a UNIQUE constraint, which you ll define as a column constraint. What SQL code should you use for the column definition You should use the following code: TYPE_NAME CHAR(10) UNIQUE 9. What two restrictions apply to PRIMARY KEY constraints but not to UNIQUE constraints A column that is defined with a PRIMARY KEY constraint cannot contain null values, and only one PRIMARY KEY constraint can be defined for each table.
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10. You re creating a PRIMARY KEY constraint named PK_ARTIST_MUSIC_TYPES on the ARTIST_MUSIC_TYPES table. The primary key includes the ARTIST_NAME and ARTIST_ DOB columns. What SQL code should you use for a table constraint You should use the following code: CONSTRAINT PK_ARTIST_MUSIC_TYPES PRIMARY KEY ( ARTIST_NAME, ARTIST_DOB ) 11. How does a referential constraint differ from a unique constraint Referential constraints are concerned with how data in one table relates to data in another table, ensuring referential integrity between the two tables. Unique constraints ensure the integrity within a table by blocking duplicate values. 12. A(n) ____________ constraint enforces referential integrity between two tables by ensuring that no action is taken to either table that affects the data protected by the constraint. FOREIGN KEY 13. You re creating a table that includes a column named BUSINESS_TYPE_ID, with a data type of INT. The column will be defined with a FOREIGN KEY constraint that references the primary key in a table named BUSINESS_TYPES. The foreign key will be added as a column constraint. What SQL code should you use for the column definition You should use the following code: BUSINESS_TYPE_ID INT REFERENCES BUSINESS_TYPES 14. What three options can you use in the MATCH clause of a FOREIGN KEY constraint FULL, PARTIAL, and SIMPLE 15. What are the two types of referential triggered actions that can be defined in a FOREIGN KEY constraint ON UPDATE and ON DELETE 16. You re creating a FOREIGN KEY constraint and want the values in the referencing column to be updated if values in the referenced column are updated. Which <referential triggered action> clause should you use A. ON UPDATE RESTRICT B. ON UPDATE NO ACTION C. ON UPDATE CASCADE D. ON UPDATE SET DEFAULT C is the correct answer. 17. What syntax should you use for a CHECK constraint that you re defining as a table constraint [ CONSTRAINT <constraint name> ] CHECK ( <search condition> )
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