create barcode using vb.net INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER in Java

Creating DataMatrix in Java INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER

INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Figure 2-12. Browsing a table
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Entering Commands
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The SQL Worksheet is where you enter commands to query and modify data. Like SQL*Plus, you can enter SQL and PL/SQL commands. Some SQL*Plus commands are supported, such as COLUMN, DESCRIBE and SPOOL. For a full list of supported and unsupported SQL*Plus commands, please refer to the Oracle SQL Developers User s Guide. The Worksheet is automatically opened when you connect to a database. If you need to open another worksheet or have closed the only one open, click on the SQL Worksheet icon or select the Tools SQL Worksheet menu option.
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Note If the Worksheet contains more than one statement, the statements must be terminated with a ; or / (on a separate line). If they are not properly terminated, the session will return an error message ORA-00933: SQL command not properly ended .
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Figure 2-13. Browsing a table s data
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Run Statement
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Unlike SQL*Plus, a statement is not automatically run when you enter a ; or /. The Run Statement (F9) command or the large green triangle icon is used to run a single command. If the worksheet contains more than one command, Run Statement will run the command immediately after the selected line, assuming that the previous statement(s) have been terminated with a ; or /. Let s start by entering the following, simple statement: SELECT * FROM EMPLOYEES; There are two things worth noting: First, the SQL statement reserved words are highlighted; second, EMPLOYEES is suggested as the table after you type FROM E. The syntax highlighting is handy when you accidentally type FORM instead of FROM. The auto-complete feature is also a time saver as it can suggest table or view and column names. Click on the Run Statement button or press F9 to execute the query and display the data in the Query Result window, as seen in Figure 2-14.
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Figure 2-14. Querying EMPLOYEES table To change the sort order of the data, double click on a column heading in the Query Result window.
Run Script
The Run Script command will run all the statements and/or SQL*Plus commands in the worksheet. This is the command to use when you have multiple statements or want to format the output using supported SQL*Plus commands. Below the SELECT * FROM EMPLOYEES; we entered in the worksheet, enter SELECT * FROM DEPARTMENTS; and then click the Run Script button or press F5. The output will be displayed in the Script Output window alongside the Query Result window. Notice that the output is almost identical to what you have seen in SQL*Plus and is displayed below in Figure 2-15.
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Figure 2-15. Querying EMPLOYEES and DEPARTMENTS tables
When running scripts, the output is appended to the Script Output window. To clear the window so that only new output is displayed, click on the Clear button (the picture of the pencil eraser).
Note Not all supported SQL*Plus commands are properly interpreted for Run Script. For example, the COLUMN command did not change the column headings, but SET FEEDBACK OFF worked as expected.
Saving Commands to a Script
After taking time to create a complex statement, it is wise to save that command to a script that you can run later. After entering the commands and statement(s), select File Save, press CTL+S, or click on the disk button to bring up the File Save dialog box. The directory that it opens should be the same one you set in the Configuration section. The File Save dialog box is shown in Figure 2-16.
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Figure 2-16. Saving employees.sql
Running a Script
To run the script we just saved, there are two ways to load and run. The SQL*Plus standard of using @ is supported. To use the @ command, type @employees.sql in the worksheet and select Run Script (F5). This is demonstrated in Figure 2-17. The second option is to select File Open and pick the employees.sql file you just saved. The commands contained in that file will be loaded into the worksheet. Select the database connection you want to use in the Choose db Connection drop down box in the upper right of the employees.sql window. Until you select the connection, the other buttons will remain grayed out. After you select the connection, press the Run Script button to see the output, as seen in Figure 2-18.
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