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15. SQL statements may be divided into the following categories: a. Data De nition Language (DDL) b. Data Control Language (DCL) c. Data Manipulation Language (DML) d. Data Selection Language (DSL) e. Data Replication Language (DRL) 16. Data De nition Language (DDL) includes the following statements: a. CREATE b. ALTER c. SELECT d. UPDATE e. DELETE 17. Data Query Language (DQL) includes the following statements: a. CREATE b. ALTER c. SELECT d. UPDATE e. DELETE
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18. Data Manipulation Language (DML) includes the following statements: a. CREATE b. ALTER c. SELECT d. UPDATE e. DELETE 19. SQL was rst developed a. By IBM b. By ANSI c. In the 1980s d. In the 1970s e. Based on ANSI standards 20. Standard numeric types include a. BOOLEAN b. INTERVAL c. NUMBER d. INTEGER e. FLOAT 21. Standard temporal data types include a. TIMESTAMP b. TIMEZONE c. TIME d. DATETIME e. DATE 22. NULL values a. Are equal to other NULL values b. Are not equal to other NULL values c. Are the same as blanks (spaces) d. Can be used to represent missing or unknown data values e. Are always allowed by default
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23. The column de nition in the CREATE TABLE statement may include a. A DEFAULT clause b. A NULL or NOT NULL clause c. The table name d. A table constraint e. The column name 24. A table column name a. Must be unique within the database b. Must be unique within the table c. Must be speci ed in the CREATE TABLE statement d. Must be speci ed in the ALTER TABLE statement e. May only be named in one index 25. A column constraint a. Can be used anywhere a table constraint can be used b. May reference one or more columns c. Uses syntax that is identical or nearly identical to a table constraint of the same type d. May be included in either a CREATE TABLE or ALTER TABLE statement e. Has syntax that varies little from one constraint type to another 26. The correct syntax for a DEFAULT clause is a. DEFAULT [UNIQUE | PRIMARY KEY] b. DEFAULT [NULL | NOT NULL] c. DEFAULT ( precision, scale) d. DEFAULT (expression) e. DEFAULT (column_name) REFERENCES table_name (column_name) 27. The correct syntax for a NOT NULL constraint is a. column_name REFERENCES NOT NULL b. column_name data_type NOT NULL c. column_name data_type IS NOT NULL d. CREATE NOT NULL INDEX ON column_name e. DEFAULT [NULL | NOT NULL]
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28. The correct syntax for a UNIQUE CONSTRAINT is a. DEFAULT UNIQUE (column_name) b. column_name REFERENCES UNIQUE table_name c. [CONSTRAINT constraint_name] UNIQUE (column_name) d. [CONSTRAINT constraint_name] UNIQUE (table_name) e. DEFAULT [UNIQUE | PRIMARY KEY] 29. The correct syntax for a REFERENTIAL CONSTRAINT is a. REFERENCES table_name (column_name) b. column_name REFERENCES UNIQUE table_name c. [CONSTRAINT constraint_name] REFERENCES index_name d. [CONSTRAINT constraint_name] REFERENCES table_name e. FOREIGN KEY column_name REFERENCES table_name (column_ name) 30. The DROP statement can be used to drop a a. Table column b. Table c. Referential constraint d. Index e. View 31. The UNION operator a. Is named JOIN in some SQL implementations b. Includes duplicate rows in the result set c. Eliminates duplicate rows in the result set d. Combines two queries into a single joined query e. Combines the result sets of two queries into a single result set 32. The proper syntax for eliminating null values in query results is a. = NULL b. IS NULL c. NOT = NULL d. IS NOT NULL e. <> NULL
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33. An SQL statement containing an aggregate function a. Must contain a GROUP BY clause
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b. May not include both GROUP BY and ORDER BY clauses c. Must include an ORDER BY clause d. May also contain calculated columns e. May also contain ordinary columns 34. A subselect a. Must be enclosed in parentheses b. Is a powerful way of calculating columns c. May be corrugated or noncorrugated d. Allows for the exible selection of rows e. May be used to select values to be applied to WHERE clause conditions 35. A join without a WHERE clause or JOIN clause a. Performs an outer join b. Performs an inner join c. Results in an error message d. Results in a Cartesian product e. Returns no rows in the result set 36. A selfjoin a. Can be either an inner or outer join b. Resolves recursive relationships c. Can never result in a Cartesian product d. Involves two different tables e. May use a subselect to further limit rows 37. A join a. Requires the use of a JOIN clause b. Requires a comma-separated table name list in the FROM clause c. Combines rows from multiple queries into a single query result d. Combines columns from two or more tables into a single query result e. Occurs whenever the FROM clause references more than one table
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