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12. How is a regular identifier distinguished from a delimited identifier in an SQL statement A delimited identifier is enclosed in double quotation marks. A regular identifier is not. 13. Which type of identifier permits spaces to be used as part of the name of an object A delimited identifier 14. Your SQL environment includes a catalog named INVENTORY. In that catalog is a schema named COMPACT_DISCS, and in that schema is a table named ARTISTS. What is the qualified name of that table INVENTORY.COMPACT_DISCS.ARTISTS 15. What three forms can the <name clause> component of a CREATE SCHEMA statement take A <name clause> in a CREATE SCHEMA statement can take any of the following three forms: <schema name> AUTHORIZATION <authorization identifier> <schema name> AUTHORIZATION <authorization identifier> 16. What are the differences between the CASCADE option and the RESTRICT option in a DROP SCHEMA statement If the CASCADE option is specified, all schema objects and SQL data within those objects are deleted from the system. If the RESTRICT option is used, the schema is deleted only if no schema objects exist. 17. Within the hierarchy of the SQL environment, how is a domain related to a catalog A domain is a schema object, which is a child object of the schema. The schema is a child object of a catalog. 18. Which type of identifier allows you to use a reserved keyword A delimited identifier
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3: Creating and Altering Tables
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1. Which kinds of base tables can you create by using a CREATE TABLE statement A. Persistent base tables B. Global temporary base tables
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C. Created local temporary tables D. Declared local temporary tables A, B, and C are the correct answers. 2. What is the primary difference between a global temporary table and a created local temporary table A global temporary table can be accessed from anywhere within the associated SQL session, whereas a created local temporary table can be accessed only within the associated module. 3. You re creating a table named AGENTS. The table includes the AGENT_ID column, which has an INT data type, and the AGENT_NAME column, which has a CHAR(60) data type. What SQL statement should you use You should use the following SQL statement: CREATE TABLE AGENTS ( AGENT_ID INT, AGENT_NAME CHAR(60) ); 4. What are the three types of data types that SQL supports Predefined, constructed, and user-defined 5. What are the four types of string data types Character strings, national character strings, bit strings, and binary strings 6. A(n) ____________ data type permits values that are based on data bits, rather than character sets or collations. This type of data type allows only values of 0 and 1. Bit string 7. What are the precision and the scale of the number 5293.472 The precision is 7 and the scale is 3. 8. What are the differences between exact numeric data types and approximate numeric data types With exact numeric data types, permitted values have a precision and scale. With approximate numeric data types, permitted values have a precision but no scale. 9. Which data types are exact numeric data types A. DOUBLE PRECISION B. DECIMAL C. REAL D. SMALLINT B and D are the correct answers.
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10. A(n) ____________ data type specifies the year, month, and day values of a date. DATE 11. What are the two types of interval data types that SQL supports Year-month intervals and day-time intervals 12. Which data type should you use to support a true/false construct that can be used for comparing values BOOLEAN 13. You are creating a distinct user-defined type named CITY. The user type is based on the CHAR(40) data type. Which SQL statement should you use You should use the following SQL statement: CREATE TYPE CITY AS CHAR(40) FINAL; 14. You re creating a table named CUSTOMERS. The table includes the CUSTOMER_NAME column and the CUSTOMER_CITY column. Both columns have a VARCHAR(60) data type. The CUSTOMER_CITY column also has a default value of Seattle. Which SQL statement should you use You should use the following SQL statement: CREATE TABLE CUSTOMERS ( CUSTOMER_NAME VARCHAR(60), CUSTOMER_CITY VARCHAR(60) DEFAULT 'Seattle' ); 15. Which SQL statement should you use to delete a column from an existing table ALTER TABLE 16. Which SQL statement should you use to delete a table definition and all its SQL data from a database DROP TABLE 17. Your database includes a table named OPERA_SINGERS. You want to add a column named NATIONALITY to the table. The column should have a VARCHAR(40) data type. What SQL statement should you use You should use the following SQL statement: ALTER TABLE OPERA_SINGERS ADD COLUMN NATIONALITY VARCHAR(40); 18. You want to delete the table definition for the OPERA_SINGERS table from your database. You also want to delete all the data and any dependencies on the table. What SQL statement should you use You should use the following SQL statement: DROP TABLE OPERA_SINGERS CASCADE;
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