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SQL> DEL SQL> L 1 select ename, bdate, deptno 2* from employees SQL>
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Note DEL is not an abbreviation for DELETE, because DELETE is a SQL command (to remove rows from a table in the database.)
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You can make any line the current one by just entering the line number, without the L (LIST) command, as shown in Listing 2-10. Listing 2-10. Using Line Numbers to Change the Current Line SQL> 1 2 3* L select code, description from courses where category = 'DSG' courses
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SQL> 2 2* from SQL> 42
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INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
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SP2-0226: Invalid line number SQL> Using line numbers, you can also replace any line in the SQL buffer without needing to use the SQL*Plus DEL command followed by a SQL*Plus INPUT command. Instead, simply enter the desired new line preceded by its line number. Listing 2-11 shows how to replace the first line and add a line at the end of the SQL buffer. Notice that the high line number (42) does not generate an error message, as it does in the example in Listing 2-10. Listing 2-11. Using Line Numbers to Change the SQL Buffer SQL> 1 select * SQL> 1 2 3* L select * from courses where category = 'DSG' by code
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SQL> 42 order SQL> 1 2 3 4* SQL> L select from where order
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* courses category = 'DSG' by code
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As explained earlier, the SQL*Plus INPUT command always inserts lines below the current line. The trick to insert extra lines before the first line is to overwrite the artificial line zero, as demonstrated in Listing 2-12. This is a rather trivial example; however, this trick can be quite useful when creating views. Views are discussed in 10. Listing 2-12. Inserting Text Before the First Line of the SQL Buffer 1 2 3 4* select from where order * courses category = DSG by code
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SQL> 0 /* this is just a comment */ SQL> 1 2 3 4 5* SQL> L /* this is just a comment */ select * from courses where category = 'DSG' order by code
INTRODUCTION TO SQL, SQL*PLUS, AND SQL DEVELOPER
Using the Ellipsis
If you are using the SQL*Plus CHANGE command, you might benefit from using three consecutive period characters, also known as the ellipsis. The examples in Listings 2-13 and 2-14 demonstrate the effect of using the ellipsis. First, we enter a new SQL command into the buffer and deliberately make a mistake. Listing 2-13. Entering a SQL Command with a Deliberate Error mgr, department_name departments location = 'SCHIERMONNIKOOG'; department_name * ERROR at line 1: ORA-00904: "DEPARTMENT_NAME": invalid identifier SQL> Normally, the last command line you entered into the SQL buffer is automatically the current line. However, if an error condition occurs (such as in Listing 2-13), the line where the error is found becomes the current line. This allows you to correct any mistakes with the SQL*Plus CHANGE command immediately, without activating any line with the SQL*Plus LIST command. Listing 2-14 shows this phenomenon; the asterisk in the L* command means to show the current line. Listing 2-14. Using the SQL*Plus L* Command and the Ellipsis (. . .) SQL> L* 1* select mgr, department_name SQL> c/d.../dname 1* select mgr, dname SQL> 3 3* where location = 'SCHIERMONNIKOOG' SQL> select 2 from 3 where select mgr,
SQL> c/s...g/BOSTON 3* where location = 'BOSTON' SQL> The last example in Listing 2-14 shows that all CHANGE command searches are case-insensitive. As you can see, the ellipsis is powerful, but it s also dangerous. For example, the command c/d.../dname searches for the first occurrence of a d on the first line, and then replaces everything to the end of the line.
SQL*Plus Editor Command Review
The SQL*Plus editor is a rather simple editor; nevertheless, it makes sense to spend some time to explore its possibilities. It might come in handy when you need to work with the Oracle DBMS in an
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