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In the next example, I m trying to enter the SQL statement, SELECT 200 - 100 FROM dual: SQL> SELECT 200 > 100 from dual; 100 from dual * ERROR at line 1: ORA-00923: FROM keyword not found where expected SQL> In the preceding example, when I started the second line after the hyphen (-), which is also the minus sign, SQL*Plus automatically interpreted it as the continuation character and issued an error because the statement was syntactically incorrect (select 200 100 from dual) You can avoid this problem by using a second hyphen (minus sign) at the end of the first line as a continuation character.

SQL> SELECT 200 - > 100 FROM dual; 200-100 ---------100 SQL> The dual table is necessary in Oracle so as to enable certain queries, since in Oracle s SQL, you must use the FROM clause in a SELECT statement (for example, SELECT sysdate FROM dual;) Microsoft SQL Server database, on the other hand, doesn t use a dual table because you can have a SELECT statement without a FROM clause in SQL Server select 200.

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benchmark@ORA10G> declare 2 l_parts part_type_tab; 3 begin 4 select parts 5 into l_parts 6 from components_or_view 7 where component_id = 1; 8 9 for i in 1 .. l_parts.count 10 loop 11 l_parts(i).part_desc := l_parts(i).part_desc || 'changed'; 12 end loop; 13 14 update components_or_view 15 set parts = l_parts 16 where component_id = 1; 17 end; 18 / PL/SQL procedure successfully completed. We are finished with enabling updates. As you can see, the code is fairly complex. Next, we ll look at how to enable inserts directly on the view.

BEGIN dbms_space.unused_space (segment_owner => 'OE', segment_name => 'PRODUCT_DESCRIPTIONS', segment_type => 'TABLE', total_blocks => v_total_blocks, total_bytes => v_total_bytes, unused_blocks => v_unused_blocks, unused_bytes => v_unused_bytes, last_used_extent_file_id => v_last_used_extent_file_id, last_used_extent_block_id => v_last_used_extent_block_id, last_used_block => v_last_used_block, partition_name => NULL); dbms_output.put_line ('Number of Total Blocks : '||v_total_blocks); 22 dbms_output.put_line ('Number of Bytes : '||v_total_bytes); 23 dbms_output.put_line ('Number of Unused Blocks : '||v_unused_blocks); 24 dbms_output.put_line ('Number of unused Bytes : '||v_unused_bytes ); 25 END; Number of Total Blocks : 384 Number of Bytes : 3145728 Number of Unused Blocks : 0 Number of unused Bytes : 0 PL/SQL procedure successfully completed. SQL>

Listing 5-6 has an additional configuration statement, set ntp broadcastdelay, that adjusts the broadcast delay for the server from the default value of 3,000 microseconds to the value specified with the command (5,000 in Listing 5-6).

9 10 11 12 13 14 15 16 17 18 19 20 21

The wonderful UTL_FILE package enables you to write to and read from operating system files easily. The UTL_FILE package provides you with a restricted version of standard operating-system stream file I/O. The procedures and functions in the UTL_FILE package let you open, read from, write to, and close the operating system files. Oracle also uses a client-side text I/O package, the TEXT_IO package, as part of the Oracle Procedure Builder.

In this section, we ll enable inserts on the object view. If we try to insert data without having created any instead of triggers, the insert operation fails as follows: benchmark@ORA10G> insert into components_or_view values 2 ( 3 3, 'component 3', 4 part_type_tab(part_type(3,6,'part 11', 'part 11 description')) 5 ); insert into components_or_view values * ERROR at line 1: ORA-01733: virtual column not allowed here For the preceding insert to work, we need to write an instead of insert trigger on the components_or_view itself as follows: benchmark@ORA10G> create or replace trigger components_or_view_io_insert 2 instead of insert on components_or_view 3 begin First, we insert into the parent relational table components_rel: 5 6 7 insert into components_rel( component_id, component_name ) values ( :new.component_id, :new.component_name );

It s easy to use the UTL_FILE package to read from and write to the operating system files. In many cases, when you need to create reports, the UTL_FILE package is ideal for creating the file, which you can then send to external sources using the FTP utility. The following sections take you through a simple example that illustrates the use of this package.

The first step in using the UTL_FILE package is to create the directory where you want to place the operating system files. You need to create a special directory for this purpose, using the following command: SQL> CREATE DIRECTORY utl_dir AS '/u50/oradata/archive_data'; /*the directory could be named anything you want - utl_dir is just an example*/

Then we insert into the child table parts_rel any new child records. Any duplicate records are filtered out based on the primary key of the child table (in this case, the primary key of the child table parts_rel is the column part_id): 9 10 11 12 13 14 15 insert into parts_rel select * from TABLE( cast( :new.parts as part_type_tab ) ) where part_id not in ( select part_id from parts_rel ); end; /

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