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1Z0-147 Oracle9i: Program with PL/SQL

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Oracle9i: Program with PL/SQL book

The fundamentals of SQL and Oracle Databases | 1Z0-147 Dumps and Real exam Questions with VCE Practice Test

Alice Rischert provides a pragmatic introduction to using SQL*Plus to question Oracle databases, with tutorials to aid you get started. Spotlighted are the choose commentary, and where and ORDER by clauses.

This chapter is from the ebook 

Chapter objectives

during this chapter, you will find out about:

Now that you're typical with the ideas of databases and schema diagrams, you are able to birth with hands-on exercises. you are going to study the basics of SQL*Plus, the application tool that lets you execute statements towards the Oracle database. After you familiarize yourself with SQL*Plus, you should be able to write SQL statements, or queries, to retrieve the statistics. SQL statements can range from very basic to totally advanced; they can be just a few words long or just a few hundred words lengthy. in this chapter, you start with the aid of writing standard SQL statements, but you can be in a position to build longer, greater advanced SQL queries very at once.

Lab 2.1: The SQL*Plus atmosphere

Lab goals

After this lab, you will be capable of:

Oracle utility runs on many different operating systems and hardware environments. that you would be able to use the SQL*Plus utility under three distinct architectural configurations: as a stand-alone computing device, in a shopper–server setup, or as iSQL*Plus within a three-tier architecture. a further piece of Oracle utility, known as SQL*internet (version 7), Net8 (version eight), or Oracle internet (edition 9i and 10g), provides the required communique protocol to the server.

STAND-on my own environment

SQL*Plus may well be run in a stand-alone environment, where each the SQL*Plus client application and the Oracle database utility reside on the same physical computing device. here's the case if you deploy both the Oracle database server and the SQL*Plus software in your individual computer.


a typical setup is a client–server environment, also known as two-tier structure, where a consumer communicates with the server. in this type of ambiance, Oracle's SQL*Plus tool resides on a client laptop comparable to a laptop or Unix notebook; the Oracle RDBMS software resides on a server. figure 2.1 indicates such a consumer–server structure.

Figure 2.1determine 2.1 customer–server structure.

The client sends SQL statements to the server, and the server responds again with the result set. The job of the database server comprises listening and managing many shoppers' requests, because in this configuration there are often distinctive client machines worried.

in its place of Oracle's SQL*Plus program, the client machine may also run another program with the potential to execute SQL statements in opposition t a database (e.g., visual simple or a customized-constructed Java program). For the client laptop's classes to communicate with the Oracle database server, the individual client desktop is usually configured with the Oracle internet utility, or the customer might also establish an Open Database Connectivity (ODBC) connection.

Three-Tier structure

starting with Oracle eight.1.7, which you could use the iSQL*Plus interface in a web browser to entry the Oracle database. It performs the identical moves as SQL*Plus. The advantage of iSQL*Plus is that you just do not should set up and configure the SQL*Plus program or Oracle internet utility for your customer laptop. so long as you utilize a suitable browser on your laptop and be aware of the URL of the Oracle HTTP server, that you could access the database. as with any connection, you without doubt want a valid person account and password.

figure 2.2 suggests the three-tiered structure of an iSQL*Plus configuration. the first tier is the customer's web browser, and the core tier is the Oracle HTTP server (internet server) that receives requests from the browser and forwards them via Oracle internet to the third tier, the Oracle database server. The Oracle web server returns effects from the database server again to the net browser for display. The three tiers may well be on one computing device but are usually on three different ones.

Figure 2.2figure 2.2 Three-tier architecture.

SQL and the Oracle Database Server

in the middle of all this software lies the SQL language. SQL commands are despatched from the client application, often known as the front end, to the server, or returned end. These commands ship instructions to the server to inform it what services to give. The server responds by way of sending back a influence to the customer, the place it is displayed with the aid of the customer software. figure 2.3 suggests a SQL observation that queries the outline column of the direction table. The SQL remark is sent to the Oracle server and the effect is displayed by using SQL*Plus.

Figure 2.3determine 2.3 SQL and the Oracle database server.

user id and password

To connect to the database and speak by the use of SQL*Plus, you ought to have a consumer identification that has been created for you. For the applications of all examples in this publication, you utilize the consumer identify pupil and the password learn. word that the consumer id and password are not case sensitive.

in case you haven't yet created the scholar schema in line with the instructions on the partner internet site discovered at http://authors.phptr.com/rischert3e, you usually are not in a position to log in with the pupil user identity and the study password. You may wish to continue to study via this lab first, create the pupil schema, after which function the exercises during this lab.

accessing the Oracle Database Server

that you may entry the Oracle server through a considerable number of front-conclusion tools. This book will talk about using Oracle's personal SQL*Plus utility (purchasable as a graphical home windows environment and as a command line interface) and the browser-based mostly iSQL*Plus.

This lab will train you one of the most fundamentals of SQL*Plus, as this device is almost always present in any Oracle database ambiance. The log on monitors for SQL*Plus and the browser-based mostly iSQL*Plus are somewhat distinctive, but with no trouble understood. that you may use either SQL*Plus or iSQL*Plus to execute your SQL statements, or in all probability you selected one other entrance-end query device that also lets you enter SQL commands. (The accomplice net site to this book lists different alternative query equipment.) transformations between SQL*Plus or iSQL*Plus are pointed out to you as you work through the publication. that you may assume that with only a few exceptions the functionality of iSQL*Plus and SQL*Plus are very similar, if no longer identical.

When working through this publication, you've got a call to make use of both a browser and access iSQL*Plus or use the SQL*Plus utility put in to your desktop.

SQL*Plus client for windows

If the SQL*Plus program is installed in your windows computer, that you could entry it by way of opting for courses, then Oracle, application construction, and SQL Plus. This launches the application and displays the go surfing dialog box akin to figure 2.4. Enter because the consumer identify student and as the Password study.

Figure 2.4determine 2.4 home windows graphical person interface log on dialog box.

in case your database is installed on the same computer as your SQL*Plus customer, you don't deserve to enter a worth in the Host String container. if you are connecting to a far flung Oracle database, enter the Oracle internet connection string supplied to you via your Oracle database administrator and recorded in your TNSNAMES.ORA file. you're going to be taught greater about this particular file later.

determine 2.5 indicates how your monitor looks after getting successfully connected to the server. effortlessly, you have got centered a connection with the Oracle database because the person scholar. The customer and the server may additionally now speak with each different.

Figure 2.5determine 2.5 SQL*Plus prompt.

when you see the SQL> command instant, SQL*Plus is ready to settle for your instructions and you can start to type. this is the default prompt for SQL*Plus.

To log out, both classification exit or stop and press enter. on the other hand, that you would be able to select Exit from the File menu or without difficulty use your mouse to shut the window.

Connecting with an internet Browser: iSQL*Plus

as an alternative of the SQL*Plus application program, that you can also use the internet-based mostly edition known as iSQL*Plus. To access the iSQL*Plus interface through your internet browser, you enter a URL. A go surfing dialog akin to determine 2.6 will seem. right here, the URL is http://scooby:5560/isqlplus and should absolutely be diverse to your individual installation.

a sound URL to connect with iSQL*Plus is in the form of http://machine_name.area:port/isqlplus. as an instance, http://mymachine.acme.com:5560/isqlplus is an instance of a URL format. As a part of the default Oracle setting up, you will always see the iSQL*Plus port number displayed. if you're doubtful about your selected port number, are trying the default port 5560.

also be aware in determine 2.6 that the area isn't shown, only the computer identify scooby. since the laptop is on a native network, which you could miss the area. as a substitute of the name of the desktop, which you could enter the IP handle. if your Oracle database server is on your own machine and also you need to access iSQL*Plus, that you could replace localhost in its place and your URL will study http://localhost:5560/isqlplus. then again, that you would be able to use the IP tackle of

Figure 2.6figure 2.6 iSQL*Plus login reveal.

Enter the person identification and password within the acceptable bins. You don't should supply the Connection Identifier (also referred to as Host string) to hook up with the default database illustration.

determine 2.7 displays the monitor you see after getting successfully logged in. word the iSQL*Plus Workspace and the message "linked as pupil@orcl" on the higher appropriate-hand aspect of the display. This shows the name of the login person, which is student, and the identify of the Oracle database illustration you're linked to, called ORCL.

Figure 2.7figure 2.7 iSQL*Plus Workspace.

on the Enter statements textual content field, often known as the enter enviornment, that you can enter instructions. if you want to run a script (e.g., the script you should execute to generate the scholar schema), that you would be able to enter the direction and name of the script or click on the load Script button to find the script. once the script is loaded into the input area, that you would be able to edit the script or with ease click the Execute button to execute the script. To logout and return to the Login display, click on the Logout icon.

beginning the iSQL*Plus utility Server

For the windows atmosphere, the iSQL*Plus application server is put in as a home windows service as part of the default Oracle database server installation and always begun automatically.

For different operating programs—or if you favor to birth iSQL*Plus from the command immediate—use the following syntax %oracle_home%\bin\isqlplusctl delivery. as an instance, if C:\ORACLE\ORA10 is your windows Oracle domestic directory where the data for the Oracle database and application server are installed, you beginning the iSQL*Plus application server with this command C:\oracle\ ora10\bin\isqlplusctl delivery.

seek advice from the accomplice web web site for extra guidance on usual iSQL*Plus installing and configuration questions.


In place of a graphical person interface such as SQL*Plus for windows or iSQL*Plus, you may additionally use a command-line interface. A command-line interface is purchasable with every Oracle version. often, you will use this interface in working systems reminiscent of Linux or Unix. Even home windows has a command-line interface and you will see it displayed in figure 2.eight. All SQL*Plus and SQL instructions function for this interface just the equal. be aware that reckoning on the working system, your editor, as well because the reduce and paste instructions, can be diverse.

Figure 2.8determine 2.eight Command line-based SQL*Plus below the home windows working gadget.

To invoke SQL*Plus, you type sqlplus on the respective working gadget's command prompt. For home windows you birth SQL*Plus by way of typing C:\> sqlplus from the home windows command instantaneous. in this instance, the username and password is supplied to birth SQL*Plus. you could also enter sqlplus and you may be induced for the consumer name and password or sqlplus scholar, as a way to prompt for the password.

The faraway Database and customary Log-on problems

commonly the database resides on a computing device aside from your customer computer, otherwise you have a choice of accessing distinctive databases. In these instances you need to supply the identify of the database in the Host String field of the go browsing dialog container (see determine 2.9) or the Connection Identifier field in iSQL*Plus. as an instance, to hook up with a database called ITCHY you have got enter this identify in the Host String box.

The host string suits an entry in a file referred to as TNSNAMES.ORA, which lists the database's IP handle (or the computer identify) and database instance identify.

Figure 2.9figure 2.9 SQL*Plus home windows graphical user interface go browsing dialog field.

essentially, the TNSNAMES.ORA file is a file containing a listing of databases with their respective technical connection advice. Your database administrator can support you with the configuration and setup of this file in case you have a remote database setup.

Following is an excerpt of a TNSNAMES.ORA file. The entries for your file will undoubtedly differ. in case you provide the host string ITCHY at log in, SQL*Plus will search for the ITCHY entry in the TNSNAMES.ORA file. The HOST entry shows the IP address (if you use a TCP/IP network), which is listed as alternatively, that you could enter the computing device identify. The SID entry identifies the identify of the Oracle illustration; right here the example is called ORCL. (if you happen to installation Oracle with the default alternate options, you may be asked to supply such an instance name [SID]. a typical default name is ORCL.)

ITCHY = (DESCRIPTION = (ADDRESS_LIST = (tackle = (PROTOCOL = TCP) (Host = (Port = 1521) ) ) (CONNECT_DATA = (SID = ORCL) ) ) SCRATCHY = (DESCRIPTION = (ADDRESS_LIST = (tackle = (PROTOCOL = TCP)(HOST = milly.columbia.edu)(PORT = 1521)) ) (CONNECT_DATA = (SERVER = committed) (SERVICE_NAME = scraty.columbia.edu) ) )

Your TNSNAMES.ORA file might also include an entry known as default. in case you don't deliver a host String within the go online dialog field, you will be linked to the database listed under the DEFAULT alternative. word, depending on your individual setup, you may additionally every now and then should specify or omit the .WORLD suffix subsequent to the host identify (such as ITCHY.WORLD or comfortably ITCHY) within the TNSNAMES.ORA file. additionally, Oracle 9i and 10g installations permit the use the format of the 2nd entry referred to as SCRATCHY. It uses a service name as a substitute of the SID.

if you're using an Oracle 10g customer comparable to SQL*Plus for windows, which you could use a new characteristic called easyconnect. It lets you make a connection without the entry being latest in the TNSNAMES.ORA file. for example, which you could hook up with SCRATCHY by using this connect identifier within the Host String box: milly.columbia.edu:1521/scraty.columbia.edu. It lists the machine identify called MILLY.COLUMBIA.EDU followed via the port quantity (the default port of the Oracle database is customarily 1521), followed via the provider name SCRATY.COLUMBIA.EDU.

normal log-on problems

however we cannot possibly record the entire errors and solutions to all log-on problems, listed below are two very average Oracle error messages.

A TNS error constantly deals with the connectivity between the server and the client. here message is displayed if the join identifier couldn't be resolved. This could be due to an invalid host string. check the values and retry.

ORA-12154: TNS: couldn't unravel the join identifier targeted

The subsequent error occurs in case you entered the inaccurate password or user name when the Oracle server tried to authenticate you as a legitimate user. Double-verify the spelling of your person name, which is pupil, and password, which is learn. (if you can not go online with this identification and password, assess the readme.txt file involving the installing of the student schema.)

ORA-01017: invalid username/password; logon denied Exiting from SQL*Plus or isql*Plus

There are a couple of methods to exit SQL*Plus. that you would be able to type EXIT or choose Exit from the File menu in the SQL*Plus home windows edition. For iSQL*Plus, you click on the Logout icon as opposed to typing EXIT as this will release gadget supplies. Exiting ends the session and the pupil user is no longer related to the database. despite the fact, there may well be different client machines related to the Oracle database; the server application continues to run, despite whether a client is linked to it.

growing THE student SCHEMA

Now that you just understand a way to go surfing to the Oracle database the usage of SQL*Plus or iSQL*Plus, here is a superb time to study the readme.txt file you downloaded from the net site observed at http://authors.phptr.com/rischert3e and create the student schema if you have not already accomplished so.

except certainly mentioned, we can now not differentiate between SQL*Plus and iSQL*Plus commands because many are well-nigh similar. For an inventory of unsupported commands see Appendix C, "SQL*Plus Command Reference."

All commands in SQL*Plus require the consumer to press the Enter key to execute them. In iSQL*Plus you always need to press the Execute button. The reminder to press the Enter key or the Execute button should not blanketed within the leisure of the examples and workout routines in this booklet.

Lab 2.1 workouts 2.1.1 identify Oracle's customer/Server utility
  • determine which piece of Oracle utility is the customer, which is the server, and how they speak with each other.

  • what is the role of SQL between customer and server?

  • 2.1.2 Login and Logout of SQL*Plus
  • once you have logged into SQL*Plus (now not iSQL*Plus) with the consumer identification scholar and password learn, what information does the SQL*Plus monitor display you? (if you do not have entry to SQL*Plus, please reply the question by way of regarding determine 2.5.)

  • What do you be trained in case you class DESCRIBE scholar and press Enter? in case you use iSQL*Plus, click the Execute button in its place of urgent Enter.

  • Execute right here command and describe what you see: demonstrate ALL.

  • Lab 2.1 endeavor answers 2.1.1 solutions
  • establish which piece of Oracle software is the client, which is the server, and how they communicate with every different.

  • answer: SQL*Plus or the browser showing iSQL*Plus is the client and the Oracle RDBMS is the server. In an Oracle 9i or 10g environment, Oracle internet is the protocol that facilitates the communications.

    answer: SQL commands are issued from the client, telling the server to perform selected movements. The server sends lower back the consequences of these instructions to the client software, the place they are displayed.

  • what is the position of SQL between customer and server?

  • 2.1.2 solutions
  • upon getting logged into SQL*Plus (not iSQL*Plus) with the person id scholar and password be trained, what assistance does the SQL*Plus display exhibit you? (in case you do not need entry to SQL*Plus, please answer the query with the aid of referring to determine 2.5.)

  • answer: The monitor indicates which version of SQL*Plus you're using, the existing date and time, Oracle copyright information, and the edition of the Oracle database you are related to. After this counsel is displayed, you see the SQL> command prompt. At this instantaneous you are able to enter instructions.

  • PL/SQL is yet another Oracle language addressed in a separate publication during this series Oracle PL/SQL by means of instance through Benjamin Rosenzweig and Elena Silvestrova (Prentice corridor, 2004).

  • What do you study in the event you class DESCRIBE scholar and press Enter? in case you use iSQL*Plus, click the Execute button in its place of urgent Enter.
  • answer: You find out concerning the constitution of the student table, mainly its column names, even if those columns allow nulls and the datatype of each and every column.

  • to write down SQL statements, you should know a table's column names and their datatypes. The SQL*Plus DESCRIBE command shows this assistance and shows if a column doesn't permit null values.

    Many SQL*Plus commands could be abbreviated. for instance, DESCRIBE can be shortened to DESC. Retype the command the usage of this abbreviation and compare the outcomes. figure 2.10 shows the result of the DESCRIBE command finished in SQL*Plus.

    Figure 2.10determine 2.10 Executing the SQL*Plus DESCRIBE command.

    SQL*Plus is not case sensitive; the consumer identity, password, and SQL*Plus instructions may all be entered in both higher or lowercase, or a combination of both. right through this publication, they are in uppercase for easy identification. in the next lab you'll learn about formatting your SQL statements and when it's acceptable to capitalize phrases.

    commonplace Datatypes

    each column in Oracle should have a datatype, which determines what type of facts can also be stored.


    The DATE datatype is used to save date and time tips. by using default the monitor layout for a date is DD-MON-YY. for example, July four, 2003 shows as 04-JUL-03. There are a few features you could use to alternate the monitor layout or to exhibit the time, which you may study in "Chapter 4, Date and Conversion capabilities."


    Columns with the datatype quantity simplest permit numerical information; no textual content, hyphens, or dashes are allowed. A column described as quantity(5,2) can have a highest of three digits earlier than the decimal point and two digits after the decimal element. the first digit (5) is referred to as the precision; the 2nd digit (2) is spoke of because the scale. The smallest allowed number is –999.99 and the biggest is 999.99. A column definition with a nil scale reminiscent of quantity(5) or number(5,0) makes it possible for integers in the range from –99,999 to 99,999.


    The VARCHAR2 and CHAR datatypes keep alphanumeric statistics (e.g., text, numbers, particular characters, and many others.). VARCHAR2 is the variable size datatype and probably the most widely used alphanumeric datatype; its maximum size is 4,000 characters. The main difference between VARCHAR2 and CHAR is that the CHAR datatype is a set-size datatype and any unused room is clean padded with areas.

    as an instance, a column defined as CHAR(10) and containing the 4-personality length cost of JOHN in a row can have six blank characters padded on the conclusion to make the total length 10 areas. (If the column is stored in a VARCHAR2(10) column in its place, it retailers four characters most effective.) A CHAR column can save as much as 2,000 characters.

    The CLOB database lets you store big amounts of textual facts. It replaces the long datatype, which is desupported in Oracle 10g.


    Datatypes similar to BFILE or BLOB require entry through selected purpose services in very extremely really expert ways in which go past the goals of this e-book. apart from the datatypes outlined, Oracle also has extra datatypes to guide selected country wide persona units (e.g., NCLOB, NVARCHAR2), intermedia datatypes, and spatial (geographic) statistics. Oracle additionally gives you the capacity to create your personal custom-made object datatypes.

    seek advice from Appendix I, "Oracle Datatypes," for an in depth checklist of the a considerable number of datatypes. for many SQL operations, you typically use the number, VARCHAR2, and a variety of DATE-connected datatypes. they're the most standard datatypes the place the substantial majority of records is saved.

  • Execute here command and describe what you see: show ALL.

  • reply: you'll see an inventory of SQL*Plus environmental variables and their present settings. using the SET command, lots of them will also be modified to suit your needs for a SQL*Plus session, which is described because the time in between should you log in and log out of SQL*Plus. for those who birth your next SQL*Plus session, youngsters, all commands might be set lower back to their defaults.

  • it's vital to observe right here that SQL*Plus instructions, corresponding to reveal and DESCRIBE, are not a part of the SQL language. you will start to type SQL commands the usage of the SQL*Plus tool within the next lab.

    in case you use iSQL*Plus, that you would be able to alternate the environment variables and settings via clicking the Preferences icon.

    Lab 2.1 Self-overview Questions

    with a view to check your development, be sure you be capable of reply right here questions.

  • The DESC command displays column names of a desk.

  • actual

  • False

  • real

  • False

  • any person can connect to an Oracle database so long as he or she has the SQL*Plus utility.

  • true

  • False

  • The SQL*Plus command reveal person shows your login name.
  • authentic

  • False

  • Typing demonstrate liberate on the prompt displays the version variety of SQL*Plus you are using.

  • true

  • False

  • The charge column of the direction desk is defined as quantity(9,2). The maximum charge of a person direction is 9,999,999.ninety nine.

  • solutions appear in Appendix A, section 2.1.

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