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1. What is the difference between a user identifier and a role name 2. What is the name of the special authorization identifier that grants access to all database users 3. Each ____________ is associated with a user identifier and role name. 4. An SQL session is associated with which of the following A Privilege B User identifier C PUBLIC D Role name 5. When an SQL session is first established, the user identifier is always the ____________. 6. What is the value of the current role name when an SQL session is first established 7. What is an authorization identifier 8. What two types of authorization identifiers does SQL support 9. Which privilege should you grant on an object if you want to allow an authorization
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identifier to query data in that object
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10. You establish an SQL session with your database. The current user identifier is EthanW.
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The current role name is null. What is the current authorization identifier
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11. On which schema objects can you define access privileges 12. On which types of database objects can you assign the DELETE privilege A Tables B Views C Columns D Domains 13. On which types of database objects can you assign the TRIGGER privilege A Tables B Views C Columns D Domains 14. You re creating a role named ACCOUNTING. Which SQL statement should you use
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15. You re granting all privileges on the CD_NAMES view to everyone who uses the database.
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Which SQL statement should you use
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16. You re granting the SELECT privilege to the SALES_CLERK role on a table in your database.
You want the SALES_CLERK role to be able to assign the SELECT privilege to other users. What clause should you include in your GRANT statement
17. You want to grant the ACCT role to the MaxN user authorization. You do not want the
user to be able to grant the role to other users. What SQL statement should you use to grant the role
Part
Data Access and Modification
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Querying SQL Data
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SQL: A Beginner s Guide
Key Skills & Concepts
Use a SELECT Statement to Retrieve Data Use the WHERE Clause to Define Search Conditions Use the GROUP BY Clause to Group Query Results Use the HAVING Clause to Specify Group Search Conditions Use the ORDER BY Clause to Sort Query Results
nce the objects in a database have been created and the base tables populated with data, you can submit queries that allow you to retrieve specific information from the database. These queries, which usually take the form of SELECT statements, can range in complexity from a simple statement that returns all columns from a table to a statement that joins multiple tables, calculates values, and defines search conditions that restrict exactly which rows of data should be returned. The SELECT statement is made up of a flexible series of clauses that together determine which data will be retrieved. In this chapter, you will learn how to use each of these clauses to perform basic data retrieval, define search conditions, group query results, specify group search conditions, and order search results.
Use a SELECT Statement to Retrieve Data
In 5, when discussing views, I introduce you to the SELECT statement. As you might recall, the SELECT statement allows you to form intricate queries that can return exactly the type of data you want to retrieve. It is one of the most common statements you ll be using as an SQL programmer, and it is also one of the most flexible and extensive statements in the SQL standard. The SELECT statement is a query expression that begins with the SELECT keyword and includes a number of elements that form the expression. The basic syntax for the SELECT statement can be split into several specific clauses that each help to refine the query so that only the required data is returned. The syntax for the SELECT statement can be shown as follows: SELECT [ DISTINCT | ALL ] { * | <select list> } FROM <table reference> [ { , <table reference> } . . . ] [ WHERE <search condition> ] [ GROUP BY <grouping specification> ] [ HAVING <search condition> ] [ ORDER BY <order condition> ] As you can see, the only required clauses are the SELECT clause and the FROM clause. All other clauses are optional.
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