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Oracle9i: Program with PL/SQL book

The fundamentals of SQL and Oracle Databases | 1Z0-147 true Questions and VCE practice Test

Alice Rischert gives a realistic introduction to the Use of SQL*Plus to question Oracle databases, with tutorials to support you obtain begun. Spotlighted are the select statement, and the status and ORDER with the aid of clauses.

This chapter is from the booklet 

Chapter aims

in this chapter, you will learn about:

Now that you are time-honored with the concepts of databases and schema diagrams, you're able to birth with hands-on exercises. you are going to gain knowledge of the fundamentals of SQL*Plus, the utility device that lets you execute statements against the Oracle database. After you become confidential with SQL*Plus, you will breathe ready to write SQL statements, or queries, to retrieve the records. SQL statements can latitude from very standard to particularly advanced; they will also breathe a number of words long or a number of hundred words long. in this chapter, you initiate by writing fundamental SQL statements, however you could breathe in a position to build longer, greater tangled SQL queries very immediately.

Lab 2.1: The SQL*Plus atmosphere

Lab ambitions

After this lab, you should breathe in a position to:

Oracle utility runs on numerous operating systems and hardware environments. that you may Use the SQL*Plus software under three discrete architectural configurations: as a stand-alone computer, in a consumer–server setup, or as iSQL*Plus inside a three-tier structure. a further piece of Oracle application, known as SQL*net (edition 7), Net8 (version eight), or Oracle web (version 9i and 10g), gives the mandatory conversation protocol to the server.

STAND-alone environment

SQL*Plus may well breathe rush in a stand-on my own ambiance, where each the SQL*Plus client software and the Oracle database software stay on the identical actual desktop. this is the case in case you deploy each the Oracle database server and the SQL*Plus application on your individual desktop.

customer–Server

a typical setup is a client–server atmosphere, also referred to as two-tier structure, the status a client communicates with the server. during this class of atmosphere, Oracle's SQL*Plus device resides on a consumer computing device comparable to a computer or Unix computing device; the Oracle RDBMS application resides on a server. determine 2.1 suggests such a shopper–server architecture.

Figure 2.1figure 2.1 customer–server architecture.

The customer sends SQL statements to the server, and the server responds returned with the outcome set. The job of the database server involves listening and managing many purchasers' requests, because in this configuration there are sometimes diverse customer machines involved.

as an alternative of Oracle's SQL*Plus program, the client laptop may also rush another program with the means to execute SQL statements towards a database (e.g., visual fundamental or a custom-constructed Java program). For the customer desktop's programs to speak with the Oracle database server, the particular person client laptop is typically configured with the Oracle net software, or the customer may establish an Open Database Connectivity (ODBC) connection.

Three-Tier structure

beginning with Oracle eight.1.7, that you may Use the iSQL*Plus interface in a web browser to access the Oracle database. It performs the selfsame movements as SQL*Plus. The knowledge of iSQL*Plus is that you simply don't exigency to installation and configure the SQL*Plus program or Oracle web utility to your customer machine. so long as you utilize a arrogate browser for your machine and understand the URL of the Oracle HTTP server, that you could entry the database. as with utter connection, you without doubt exigency a sound user account and password.

figure 2.2 suggests the three-tiered architecture of an iSQL*Plus configuration. the first tier is the customer's net browser, and the core tier is the Oracle HTTP server (net server) that receives requests from the browser and forwards them by means of Oracle web to the third tier, the Oracle database server. The Oracle net server returns outcomes from the database server lower back to the net browser for monitor. The three tiers may breathe on one machine but are customarily on three different ones.

Figure 2.2determine 2.2 Three-tier architecture.

SQL and the Oracle Database Server

in the midst of utter this utility lies the SQL language. SQL commands are sent from the customer utility, also known as the entrance conclusion, to the server, or again end. These instructions ship instructions to the server to inform it what features to supply. The server responds through sending back a influence to the customer, where it's displayed by way of the customer software. determine 2.three indicates a SQL observation that queries the description column of the route desk. The SQL observation is shipped to the Oracle server and the outcomes is displayed by SQL*Plus.

Figure 2.3determine 2.3 SQL and the Oracle database server.

user identity and password

To connect with the database and communicate by means of SQL*Plus, you ought to absorb a user identity that has been created for you. For the applications of utter examples during this publication, you employ the consumer appellation student and the password breathe trained. note that the user id and password are not case delicate.

if you haven't yet created the pupil schema based on the guidelines on the associate internet site located at http://authors.phptr.com/rischert3e, you usually are not capable of log in with the student person identification and the learn password. You may want to continue to examine through this lab first, create the pupil schema, after which duty the exercises in this lab.

getting access to the Oracle Database Server

which you could access the Oracle server via a number of entrance-conclusion equipment. This publication will discuss the Use of Oracle's own SQL*Plus application (accessible as a graphical windows atmosphere and as a command line interface) and the browser-primarily based iSQL*Plus.

This lab will teach you probably the most fundamentals of SQL*Plus, as this device is almost always present in any Oracle database ambiance. The retrograde surfing monitors for SQL*Plus and the browser-based mostly iSQL*Plus are a minute bit distinctive, however comfortably understood. that you could Use both SQL*Plus or iSQL*Plus to execute your SQL statements, or perhaps you chose an additional front-conclusion question device that also permits you to enter SQL instructions. (The accomplice net web site to this e-book lists other alternative query tools.) ameliorations between SQL*Plus or iSQL*Plus are cited to you as you work throughout the book. that you can assume that with very few exceptions the performance of iSQL*Plus and SQL*Plus are very similar, if no longer similar.

When working via this booklet, you absorb a conclusion to design Use of either a browser and access iSQL*Plus or Use the SQL*Plus application do in in your machine.

SQL*Plus client for home windows

If the SQL*Plus application is do in for your windows desktop, you can access it by determining programs, then Oracle, application construction, and SQL Plus. This launches the software and displays the retrograde surfing dialog container comparable to determine 2.four. Enter because the user appellation scholar and because the Password breathe trained.

Figure 2.4figure 2.four windows graphical user interface retrograde surfing dialog container.

in case your database is installed on the selfsame computing device as your SQL*Plus customer, you don't should enter a value within the Host String box. when you are connecting to a far flung Oracle database, enter the Oracle internet connection string presented to you with the aid of your Oracle database administrator and recorded on your TNSNAMES.ORA file. you will breathe taught more about this particular file later.

figure 2.5 suggests how your disclose appears after you absorb efficaciously related to the server. comfortably, you absorb got dependent a reference to the Oracle database as the person student. The customer and the server may additionally now talk with each and every different.

Figure 2.5determine 2.5 SQL*Plus on the spot.

should you perceive the SQL> command instant, SQL*Plus is able to settle for your commands and you'll initiate to category. here is the default instantaneous for SQL*Plus.

To log out, both classification exit or stop and press enter. then again, which you can select Exit from the File menu or without problems Use your mouse to shut the window.

Connecting with a web Browser: iSQL*Plus

as a substitute of the SQL*Plus utility program, which you can additionally Use the web-primarily based edition referred to as iSQL*Plus. To entry the iSQL*Plus interface through your net browser, you enter a URL. A log on dialog similar to figure 2.6 will appear. here, the URL is http://scooby:5560/isqlplus and should surely breathe distinctive on your particular person installation.

a legitimate URL to connect to iSQL*Plus is in the variety of http://machine_name.domain:port/isqlplus. as an example, http://mymachine.acme.com:5560/isqlplus is an instance of a URL format. As a piece of the default Oracle setting up, you'll always perceive the iSQL*Plus port quantity displayed. when you are doubtful about your particular port number, are trying the default port 5560.

additionally celebrate in determine 2.6 that the domain isn't proven, only the laptop appellation scooby. because the laptop is on a native community, that you may pass over the area. instead of the appellation of the laptop, you could enter the IP address. in case your Oracle database server is on your personal machine and also you are looking to entry iSQL*Plus, you could substitute localhost instead and your URL will examine http://localhost:5560/isqlplus. alternatively, which you can Use the IP address of 127.0.0.1.

Figure 2.6determine 2.6 iSQL*Plus login display.

Enter the consumer identification and password in the arrogate containers. You don't exigency to give the Connection Identifier (also referred to as Host string) to connect to the default database illustration.

determine 2.7 displays the monitor you perceive once you absorb effectively logged in. note the iSQL*Plus Workspace and the message "connected as pupil@orcl" on the upper appropriate-hand aspect of the monitor. This shows the identify of the login user, which is student, and the identify of the Oracle database illustration you're related to, referred to as ORCL.

Figure 2.7figure 2.7 iSQL*Plus Workspace.

at the Enter statements text field, often known as the input enviornment, that you can enter commands. in case you are looking to rush a script (e.g., the script you should execute to generate the scholar schema), that you can enter the route and identify of the script or click on the load Script button to find the script. as soon as the script is loaded into the enter enviornment, which you could edit the script or with ease click on the Execute button to execute the script. To logout and revert to the Login monitor, click on the Logout icon.

starting the iSQL*Plus utility Server

For the home windows environment, the iSQL*Plus utility server is do in as a home windows carrier as piece of the default Oracle database server setting up and constantly utter started automatically.

For different working methods—or in case you favor to rise iSQL*Plus from the command prompt—use prerogative here syntax %oracle_home%\bin\isqlplusctl birth. as an instance, if C:\ORACLE\ORA10 is your home windows Oracle domestic directory the status the information for the Oracle database and software server are do in, you birth the iSQL*Plus software server with this command C:\oracle\ ora10\bin\isqlplusctl birth.

seek advice from the associate net site for extra information on conventional iSQL*Plus installation and configuration questions.

COMMAND-LINE INTERFACES FOR Sql*PLus

In district of a graphical person interface equivalent to SQL*Plus for windows or iSQL*Plus, you can also Use a command-line interface. A command-line interface is obtainable with each Oracle edition. frequently, you will Use this interface in working methods corresponding to Linux or Unix. Even home windows has a command-line interface and you may perceive it displayed in figure 2.8. utter SQL*Plus and SQL commands operate for this interface just the identical. breathe sensible that reckoning on the working equipment, your editor, as neatly because the reduce and paste instructions, may well breathe diverse.

Figure 2.8figure 2.eight Command line-based SQL*Plus beneath the home windows working device.

To invoke SQL*Plus, you classification sqlplus on the respective operating equipment's command instant. For home windows you rise SQL*Plus by using typing C:\> sqlplus from the home windows command immediate. during this instance, the username and password is offered to start SQL*Plus. which you can also enter sqlplus and you may breathe triggered for the consumer appellation and password or sqlplus student, so they can on the spot for the password.

The faraway Database and common Log-on problems

regularly the database resides on a computing device aside from your customer machine, otherwise you absorb a conclusion of getting access to distinctive databases. In these circumstances you exigency to deliver the appellation of the database in the Host String field of the retrograde browsing dialog box (see figure 2.9) or the Connection Identifier container in iSQL*Plus. for instance, to connect with a database called ITCHY you absorb got enter this appellation within the Host String field.

The host string suits an entry in a file called TNSNAMES.ORA, which lists the database's IP ply (or the computer name) and database illustration identify.

Figure 2.9figure 2.9 SQL*Plus home windows graphical person interface log on dialog container.

essentially, the TNSNAMES.ORA file is a file containing a listing of databases with their respective technical connection tips. Your database administrator can aid you with the configuration and setup of this file when you absorb a far flung database setup.

Following is an excerpt of a TNSNAMES.ORA file. The entries to your file will certainly range. if you provide the host string ITCHY at log in, SQL*Plus will lookup the ITCHY entry within the TNSNAMES.ORA file. The HOST entry suggests the IP ply (in case you Use a TCP/IP network), which is listed as 169.254.147.245. on the other hand, that you would breathe able to enter the computing device identify. The SID entry identifies the identify of the Oracle instance; prerogative here the instance is called ORCL. (in case you deploy Oracle with the default options, you should breathe asked to deliver such an illustration identify [SID]. a typical default identify is ORCL.)

ITCHY = (DESCRIPTION = (ADDRESS_LIST = (tackle = (PROTOCOL = TCP) (Host = 169.254.147.245) (Port = 1521) ) ) (CONNECT_DATA = (SID = ORCL) ) ) SCRATCHY = (DESCRIPTION = (ADDRESS_LIST = (handle = (PROTOCOL = TCP)(HOST = milly.columbia.edu)(PORT = 1521)) ) (CONNECT_DATA = (SERVER = dedicated) (SERVICE_NAME = scraty.columbia.edu) ) )

Your TNSNAMES.ORA file may accommodate an entry called default. in case you execute not give a bunch String in the retrograde browsing dialog field, you can breathe linked to the database listed beneath the DEFAULT option. word, counting on your particular person setup, you might also from time to time deserve to specify or leave out the .WORLD suffix next to the host identify (equivalent to ITCHY.WORLD or effectively ITCHY) in the TNSNAMES.ORA file. additionally, Oracle 9i and 10g installations enable the Use the format of the 2nd entry known as SCRATCHY. It makes Use of a carrier appellation in its status of the SID.

if you are using an Oracle 10g customer corresponding to SQL*Plus for windows, that you can Use a new feature called easyconnect. It lets you design a connection devoid of the entry being existing within the TNSNAMES.ORA file. as an instance, you could connect with SCRATCHY by using this connect identifier in the Host String box: milly.columbia.edu:1521/scraty.columbia.edu. It lists the computing device identify known as MILLY.COLUMBIA.EDU followed by way of the port quantity (the default port of the Oracle database is typically 1521), adopted via the carrier identify SCRATY.COLUMBIA.EDU.

commonplace log-on complications

however they can't possibly checklist utter of the blunders and options to utter log-on issues, listed here are two very ordinary Oracle mistake messages.

A TNS mistake always deals with the connectivity between the server and the client. here message is displayed if the join identifier could not breathe resolved. This can breathe as a result of an invalid host string. assess the values and retry.

ORA-12154: TNS: could not unravel the connect identifier distinct

The subsequent mistake happens if you entered the incorrect password or consumer appellation when the Oracle server attempted to authenticate you as a legitimate consumer. Double-determine the spelling of your user identify, which is scholar, and password, which is study. (in case you can not retrograde surfing with this id and password, investigate the readme.txt file regarding the installation of the student schema.)

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

There are a number of how to exit SQL*Plus. that you can class EXIT or select Exit from the File menu within the SQL*Plus home windows edition. For iSQL*Plus, you click the Logout icon in status of typing EXIT as this could release device supplies. Exiting ends the session and the student consumer is no longer related to the database. although, there can breathe other client machines connected to the Oracle database; the server software continues to run, even with no matter if a consumer is connected to it.

creating THE scholar SCHEMA

Now that you just know how to log on to the Oracle database the usage of SQL*Plus or iSQL*Plus, here is a fine time to study the readme.txt file you downloaded from the internet web page create at http://authors.phptr.com/rischert3e and create the pupil schema in case you absorb not already completed so.

until certainly mentioned, they are able to no longer differentiate between SQL*Plus and iSQL*Plus commands as a result of many are almost identical. For a list of unsupported commands perceive Appendix C, "SQL*Plus Command Reference."

All instructions in SQL*Plus require the user to press the Enter key to execute them. In iSQL*Plus you utter the time deserve to press the Execute button. The reminder to press the Enter key or the Execute button are usually not protected within the leisure of the examples and workout routines during this book.

Lab 2.1 workouts 2.1.1 identify Oracle's customer/Server application
  • establish which piece of Oracle utility is the client, which is the server, and how they talk with each different.

  • what's the role of SQL between client and server?

  • 2.1.2 Login and Logout of SQL*Plus
  • upon getting logged into SQL*Plus (not iSQL*Plus) with the consumer identification scholar and password learn, what assistance does the SQL*Plus screen disclose you? (if you would not absorb access to SQL*Plus, tickle retort the question with the aid of referring to determine 2.5.)

  • What execute you breathe taught should you category characterize pupil and press Enter? if you Use iSQL*Plus, click on the Execute button as an alternative of urgent Enter.

  • Execute the following command and characterize what you see: note ALL.

  • Lab 2.1 recreation solutions 2.1.1 solutions
  • determine which piece of Oracle software is the client, which is the server, and the way they talk with every other.

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

    reply: SQL instructions are issued from the client, telling the server to duty selected actions. The server sends lower back the results of these directions to the customer utility, the status they are displayed.

  • what's the role of SQL between client and server?

  • 2.1.2 solutions
  • after you absorb logged into SQL*Plus (not iSQL*Plus) with the user identity pupil and password breathe trained, what counsel does the SQL*Plus disclose demonstrate you? (in case you shouldn't absorb entry to SQL*Plus, tickle retort the query via referring to figure 2.5.)

  • answer: The disclose shows which version of SQL*Plus you're using, the present date and time, Oracle copyright counsel, and the version of the Oracle database you are related to. After this information is displayed, you perceive the SQL> command instant. At this immediate you are in a position to enter commands.

  • PL/SQL is one other Oracle language addressed in a sever ebook during this collection Oracle PL/SQL through instance via Benjamin Rosenzweig and Elena Silvestrova (Prentice hall, 2004).

  • What execute you gain knowledge of for those who category characterize scholar and press Enter? if you Use iSQL*Plus, click the Execute button instead of pressing Enter.
  • reply: You discover concerning the constitution of the scholar desk, peculiarly its column names, no matter if those columns enable nulls and the datatype of each and every column.

  • to jot down SQL statements, you exigency to comprehend a desk's column names and their datatypes. The SQL*Plus characterize command displays this information and indicates if a column does not enable null values.

    Many SQL*Plus instructions may breathe abbreviated. for instance, characterize may breathe shortened to DESC. Retype the command using this abbreviation and compare the effects. figure 2.10 displays the outcomes of the characterize command done in SQL*Plus.

    Figure 2.10figure 2.10 Executing the SQL*Plus characterize command.

    SQL*Plus is not case delicate; the person identification, password, and SQL*Plus commands might also utter breathe entered in either higher or lowercase, or a combination of both. during this publication, they are in uppercase for handy identification. in the subsequent lab you're going to study formatting your SQL statements and when it's arrogate to capitalize phrases.

    normal Datatypes

    every column in Oracle ought to absorb a datatype, which determines what classification of records will also breathe kept.

    DATE

    The DATE datatype is used to redeem date and time assistance. with the aid of default the screen structure for a date is DD-MON-YY. for example, July four, 2003 shows as 04-JUL-03. There are a number of functions that you may Use to exchange the disclose layout or to note the time, which you will learn about in "Chapter four, Date and Conversion capabilities."

    quantity

    Columns with the datatype quantity handiest permit numerical statistics; no textual content, hyphens, or dashes are allowed. A column described as quantity(5,2) can absorb a highest of three digits before the decimal factor and two digits after the decimal point. the first digit (5) is known as the precision; the second digit (2) is mentioned because the scale. The smallest allowed number is –999.99 and the biggest is 999.ninety nine. A column definition with a 0 scale comparable to quantity(5) or number(5,0) makes it feasible for integers in the compass from –99,999 to ninety nine,999.

    VARCHAR2 and CHAR

    The VARCHAR2 and CHAR datatypes preserve alphanumeric information (e.g., textual content, numbers, special characters, and so forth.). VARCHAR2 is the variable size datatype and probably the most time-honored alphanumeric datatype; its optimum size is 4,000 characters. The leading change between VARCHAR2 and CHAR is that the CHAR datatype is a difficult and fast-length datatype and any unused room is spotless padded with areas.

    for example, a column defined as CHAR(10) and containing the four-persona size price of JOHN in a row can absorb six blank characters padded at the cease to design the whole size 10 areas. (If the column is saved in a VARCHAR2(10) column in its place, it outlets four characters handiest.) A CHAR column can redeem up to 2,000 characters.

    The CLOB database permits you to store enormous quantities of textual statistics. It replaces the lengthy datatype, which is desupported in Oracle 10g.

    different

    Datatypes equivalent to BFILE or BLOB require access via sure purpose functions in very tremendously really expert ways in which retrograde beyond the targets of this booklet. in addition to the datatypes outlined, Oracle also has further datatypes to support sure country wide persona units (e.g., NCLOB, NVARCHAR2), intermedia datatypes, and spatial (geographic) data. Oracle also gives you the capacity to create your own custom-made object datatypes.

    seek advice from Appendix I, "Oracle Datatypes," for a particular list of the quite a lot of datatypes. for many SQL operations, you usually Use the number, VARCHAR2, and quite a few DATE-linked datatypes. they're the most commonly used datatypes where the much majority of statistics is kept.

  • Execute here command and characterize what you see: exhibit ALL.

  • reply: you are going to perceive a list of SQL*Plus environmental variables and their latest settings. using the SET command, many of them will also breathe modified to suit your wants for a SQL*Plus session, which is described as the time in between should you log in and log out of SQL*Plus. should you birth your subsequent SQL*Plus session, despite the fact, utter commands could breathe set again to their defaults.

  • it's crucial to breathe sensible here that SQL*Plus instructions, corresponding to demonstrate and DESCRIBE, aren't piece of the SQL language. you will initiate to classification SQL commands using the SQL*Plus device within the next lab.

    in case you Use iSQL*Plus, that you can alternate the ambiance variables and settings by way of clicking the Preferences icon.

    Lab 2.1 Self-evaluate Questions

    with a purpose to verify your growth, you should breathe in a position to reply prerogative here questions.

  • The DESC command displays column names of a desk.

  • genuine

  • False

  • actual

  • False

  • anyone can hook up with an Oracle database as long as he or she has the SQL*Plus utility.

  • genuine

  • False

  • The SQL*Plus command disclose consumer shows your login name.
  • real

  • False

  • Typing disclose unlock at the immediate shows the version number of SQL*Plus you're the usage of.

  • authentic

  • False

  • The freight column of the route desk is described as number(9,2). The highest can freight of a person direction is 9,999,999.ninety nine.

  • answers loom in Appendix A, district 2.1.


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