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Table 12-2. Long Types Compared to LOBs LONG/LONG RAW Type You may have only one LONG or LONG RAW column per table. User-defined types may not be defined with attributes of type LONG/LONG RAW. LONG types may not be referenced in the WHERE clause. CLOB/BLOB Type You may have up to 1,000 columns of CLOB or BLOB type per table. User-defined types may fully use CLOB and BLOB types. LOBs may be referenced in the WHERE clause, and a host of functions is supplied in the DBMS_LOB package to manipulate them. LOBs do support distributed transactions.

SQL> CREATE DIRECTORY ext_data_dir AS '/u01/oradata/ext_data'; Directory created SQL> GRANT READ, WRITE ON DIRECTORY ext_data_dir TO samalapati; Grant succeeded SQL> Once you create the directory object ext_data_dir and grant the proper rights, you can then use this as the default directory for placing all the external datafiles as well as output files The LOCATION parameter in the external table creation statement shown in Listing 13-3 simply names the external datafile, which will be located in the default directory specified by ext_data_dir For demonstration purposes, let s create a new table named costs, into which you ll eventually load the aggregate data (the totals of the unit_cost and unit_price columns) from the external datafile (external table): SQL> CREATE TABLE costs 2 (sale_date DATE, 3 product_id NUMBER(6), 4 unit_cost NUMBER (10,2), 5 unit_price NUMBER(10,2)); Table created.

ADD_MONTHS(DATE,12*n) DATE + NUMTOYMINTERVAL(n,'year')

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Now you re ready to insert the necessary aggregate data from the external table (external file, actually) sales_ext into the new costs table This process of first reading data from an external table and then loading it into a normal database table is called loading data Listing 13-4 shows how to insert data into a normal table from an external table The Oracle table is named costs, and sales_ext is the external table Listing 13-4 Loading Data into a Normal Table from an External Table SQL> INSERT INTO costs (sale_date, product_id, unit_cost, unit_price) SELECT sale_date, product_id, sum(unit_cost), sum(unit_price) FROM sales_ext GROUP BY time_id, prod_id; SQL> Note that you can insert only some of the columns in the external table if you choose, and you can transform the data before it s even loaded into your tables.

LONG types do not support distributed transactions. LONG types cannot be replicated using basic or advanced replication. LONG columns cannot be in a GROUP BY, ORDER BY, or CONNECT BY, or in a query that uses DISTINCT, UNIQUE, INTERSECT, MINUS, or UNION. PL/SQL functions/procedures cannot accept an input of type LONG. SQL built-in functions cannot be used against LONG columns (e.g., SUBSTR). You cannot use a LONG type in a CREATE TABLE AS SELECT statement. You cannot use ALTER TABLE MOVE on a table containing LONG types.

This is the key difference between using external tables and SQL*Loader to load data into Oracle tables The SQL*Loader tool permits you to perform data transformation, but its capabilities in that area are extremely limited, as you saw earlier in this chapter You can use just about any arbitrary SQL transformations when creating an external table..

In general, when using the Oracle DATE type I recommend the following: Use the NUMTODSINTERVAL built-in function to add hours, minutes, and seconds. Add a simple number to add days. Use the ADD_MONTHS built-in function to add months and years. I do not recommend using the NUMTOYMINTERVAL function. The reason has to do with how the functions behave at the months end. The ADD_MONTHS function treats the end of month days specially. It will in effect round the dates for us; for example, if we add one month to a month that has 31 days and the next

The terms loading and unloading in the context of external tables can be confusing, so let s pause and make sure you understand these terms without any ambiguity. When you deal with external tables, this is what these terms mean:

LOBs may appear in these clauses provided a function is applied to the LOB that converts it into a scalar SQL type such as a VARCHAR2, NUMBER, or DATE. PL/SQL works fully with LOB types.

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