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A multiline comment begins with the combination of a slash and an asterisk (/*), and continues until the reverse combination (*/) is encountered. Be careful to end comments correctly, or many lines of SQL that you carefully wrote will be treated as comments by the RDBMS. Here is an example of a multiline comment:
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/* This is a multi-line comment. It continues until the ending combination of characters appears. */
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CHAPTER 2 SQL Concepts
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SQL statements are divided into categories based on the function that they serve. Some experts consider these categories to be either separate languages or sublanguages. However, in SQL they all have the same basic syntax and rules, so I consider them to be categories of statements within a single language. The categories, each of which is described in a subsequent section, are Data De nition Language (DDL) Data Query Language (DQL) Data Manipulation Language (DML) Data Control Language (DCL) Transaction Control Commands
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Data De nition Language (DDL) includes SQL statements that allow the database user to create and modify the structure of database objects, such as tables, views, and indexes. SQL statements that use the commands CREATE, ALTER, and DROP are considered part of DDL. It is important to understand that DDL statements affect the containers that hold the data in the database rather than the data itself. So there are DDL statements to create, drop, and alter tables, but none of these statements provide the ability to create or modify rows of data in those tables. DDL statements are presented in 3.
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Data Query Language (DQL) includes SQL statements that retrieve data from the database. Although it s a very important part of SQL, DQL consists of statements that use only one command: SELECT. DQL is presented in s 4, 5, and 6. Some vendors and authors lump DQL in with DML when they categorize SQL statements.
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Data Manipulation Language (DML)
Data Manipulation Language (DML) includes SQL statements that allow the database user to add data to the database (in the form of rows in tables), remove data from the database, and modify existing data in the database. SQL statements that
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use the commands INSERT, UPDATE, and DELETE are considered part of DML. DML is presented in 7.
Data Control Language (DCL)
Data Control Language (DCL) includes SQL statements that allow administrators to control access to the data within the database and the use of various DBMS system privileges, such as the ability to start up or shut down the database. SQL statements that use the commands GRANT and ALTER are considered part of DCL. DCL is presented in 8.
Transaction Control Commands
A database transaction is a set of commands that a database user wishes to treat as an all or nothing unit of work, meaning the entire transaction must either succeed or fail. The commands that control database transactions do not precisely conform to the syntax of SQL statements, but they do have a profound effect on the behavior of the SQL statements included in transactions. Transaction control commands are presented in 9.
Quiz
Choose the correct responses to each of the multiple-choice questions. Note that there may be more than one correct response to each question. 1. SQL a. May be pronounced as the letters S-Q-L b. May be pronounced as the word sequel c. May be used to render web pages d. May be used to communicate with any database e. May be used to communicate with relational databases 2. SQL is a. An object-oriented language b. A procedural language c. A nonprocedural language
CHAPTER 2 SQL Concepts
d. A declarative language e. A standard language 3. Procedural extensions to SQL include a. Java b. Oracle PL/SQL c. C++ d. Microsoft Transact-SQL e. FORTRAN 4. In a client/server arrangement a. The DBMS software runs on the server b. The DBMS software runs on the client c. The SQL client software runs on the client d. The SQL client software may run on the server e. The database resides on disks connected to the client 5. A command-line SQL client a. Requires a windowing system b. Runs on a wide variety of clients c. Requires a web browser on the client d. Displays data and command options using graphical features e. Displays responses to commands as text messages 6. A GUI SQL client a. Requires a windowing system b. Runs on a wide variety of clients c. Requires a web browser on the client d. Displays data and command options using graphical features e. Displays responses to commands as text messages 7. A web-based SQL client a. Requires a windowing system b. Runs on a wide variety of clients c. Requires a web browser on the client d. Displays data and command options using graphical features e. Displays responses to commands as text messages
8. SQL clients offered by Oracle are a. iSQL b. Query Analyzer c. iSQL*Plus d. SQL*Plus e. SQL Worksheet 9. SQL clients offered by Microsoft are a. iSQL b. Query Analyzer c. iSQL*Plus d. SQL*Plus e. SQL Worksheet 10. SQL was rst developed a. By IBM b. By ANSI c. In 1982 d. In the 1970s e. Based on ANSI standards 11. SQL standards include a. SQL-88 b. SQL-89 c. SQL-92 d. SQL-99 e. SQL:2003 12. Vendor extensions to SQL a. Make SQL more portable b. Make SQL less portable c. Help differentiate vendor products d. Were based on market demands e. Are compatible across vendor implementations
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