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

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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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Listing 2-5. Using the SQL*Plus LIST and CHANGE Commands SQL> L 1 select * 2* from employees SQL> L1 1* select * SQL> c/*/eename, bdate/ 1* select eename, bdate SQL> L 1 select eename, bdate 2* from employees SQL> Instead of slashes (/), you can use any arbitrary character for the string delimiter (separator) in the CHANGE command. Also, a space character between the C and the first separator is not mandatory, and you can omit the last string delimiter too. Now, let s try to execute the SQL command in the buffer again. The SQL*Plus command to execute the contents of the SQL buffer is RUN, abbreviated to R. Apparently we made a mistake; we get an Oracle error message, as shown in Listing 2-6. Observe the error message. First, it shows a line number indication (ERROR at line 1), and within that line, an asterisk (*) indicates the position where the error was detected. Listing 2-6 also shows a first attempt to correct the error and the erroneous result of our CHANGE command. Listing 2-6. Fixing Typos with the SQL*Plus CHANGE Command SQL> R 1 select eename, bdate 2* from employees select eename, bdate * ERROR at line 1: ORA-00904: "EENAME": invalid identifier SQL> c/e// 1* slect eename, bdate SQL> We removed the first occurrence of an e on the first line, instead of the e in eename. This is the default (and only) way the CHANGE command works. This means that you must be careful with this command and be sure to specify appropriate search strings for replacement. In this case, it would have been better to issue the c/ee/e/ command instead. You can also add text at the end of the current line using the SQL*Plus APPEND command, which is abbreviated A. Listing 2-7 shows how we can first fix the mistake, and then add one more column to the SELECT expression.
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Listing 2-7. Appending Text with the SQL*Plus APPEND Command SQL> L1 1* slect eename, bdate SQL> c/slect ee/select e/ 1* select ename, bdate SQL> A , deptno 1* select ename, bdate, deptno SQL> L 1 select ename, bdate, deptno 2* from employees SQL> Note that the SQL*Plus APPEND command does not insert a space by default. In this case, we don t need a space, but otherwise you should specify a second space character after the APPEND command. You can also add one or more additional lines to the SQL buffer with the SQL*Plus INPUT command (abbreviated I), as shown in Listing 2-8. The lines you enter are added below the current line. If the current line is the last line in the buffer, the new lines are added at the end of the statement. This also means you need a special trick to add lines before the first line, as you ll learn in the next section. Notice the line numbering; SQL*Plus automatically generates appropriate line numbers while entering text. You can stop entering additional lines by pressing the Enter key twice, or by entering a semicolon when you are adding lines at the end of the buffer. Listing 2-8. Inserting Text with the SQL*Plus INPUT Command 1 select ename, bdate, deptno 2* from employees SQL> I 3 where ENAME -------ALLEN WARD MARTIN BLAKE TURNER JONES SQL> deptno = 30;
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BDATE DEPTNO ----------- -------20-FEB-1961 30 22-FEB-1962 30 28-SEP-1956 30 01-NOV-1963 30 28-SEP-1968 30 03-DEC-1969 30
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Note The I is an abbreviation for INPUT, not for INSERT. INSERT is a SQL command (to add rows to a table in the database).
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The SQL*Plus DEL command deletes the current line from the SQL buffer. You can optionally specify a line number with the DEL command to remove a certain line from the SQL buffer without making that line the current line first, or a range of line numbers to remove several lines with a single DEL command. See Listing 2-9 for an example. Listing 2-9. Deleting Lines with the SQL*Plus DEL Command SQL> 1 2 3* L select ename, bdate, deptno from employees where deptno = 30
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