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ops$tkyte@ORA10G> select dt, dt+numtoyminterval(1,'month') 2 from (select to_date('28-feb-2001','dd-mon-yyyy') dt from dual ) 3 / DT DT+NUMTOYMINTERVAL(1 -------------------- -------------------28-feb-2001 00:00:00 28-mar-2001 00:00:00 Notice how the resulting date is not the last day of the next month, but rather the same day of the next month. It is arguable that this behavior is acceptable, but consider what happens when the resulting month doesn t have that many days: ops$tkyte@ORA10G> select dt, dt+numtoyminterval(1,'month') 2 from (select to_date('30-jan-2001','dd-mon-yyyy') dt from dual ) 3 / select dt, dt+numtoyminterval(1,'month') * ERROR at line 1: ORA-01839: date not valid for month specified ops$tkyte@ORA10G> select dt, dt+numtoyminterval(1,'month') 2 from (select to_date('30-jan-2000','dd-mon-yyyy') dt from dual ) 3 / select dt, dt+numtoyminterval(1,'month') * ERROR at line 1: ORA-01839: date not valid for month specified In my experience, that makes using a month interval in date arithmetic impossible in general. A similar issue arises with a year interval: adding one year to February 29, 2000, results in a runtime error as well, because there is no February 29, 2001.

The example in Listing 13-5 shows how you can create an external table and populate it with data from an external flat file using the ORACLE_DATAPUMP access driver rather than the ORACLE_LOADER driver. Listing 13-5. Creating an External Table with the ORACLE_DATAPUMP Access Driver SQL> CREATE TABLE test_xt( 2 product_id NUMBER(6), 3 warehouse_id NUMBER(3), 4 quantity_on_hand NUMBER(8)) 5 ORGANIZATION EXTERNAL( 6 TYPE ORACLE_DATAPUMP 7 DEFAULT DIRECTORY ext_data_dir 8 LOCATION ('test_xt.dmp')); Table created. SQL> To load data from this external table into an existing database table, you can use the INSERT INTO . . . SELECT clause, as shown earlier in Listing 13-4.

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A question that arises frequently is, What about the data dictionary in Oracle It is littered with LONG columns, and this makes using the dictionary columns problematic. For example, it is not possible using SQL to search the ALL_VIEWS dictionary view to find all views that contain the text HELLO: ops$tkyte@ORA11GR2> select * 2 from all_views 3 where text like '%HELLO%'; where text like '%HELLO%' * ERROR at line 3: ORA-00932: inconsistent datatypes: expected NUMBER got LONG This issue is not limited to the ALL_VIEWS view; many views are affected: ops$tkyte@ORA11GR2> select table_name, column_name 2 from dba_tab_columns 3 where data_type in ( 'LONG', 'LONG RAW' ) 4 and owner = 'SYS' 5 and table_name like 'DBA%'; TABLE_NAME -----------------------------DBA_ADVISOR_SQLPLANS DBA_ARGUMENTS DBA_CLUSTER_HASH_EXPRESSIONS DBA_CONSTRAINTS DBA_IND_EXPRESSIONS DBA_IND_PARTITIONS DBA_IND_SUBPARTITIONS DBA_MVIEWS DBA_MVIEW_AGGREGATES DBA_MVIEW_ANALYSIS DBA_NESTED_TABLE_COLS DBA_OUTLINES DBA_REGISTERED_MVIEWS DBA_REGISTERED_SNAPSHOTS DBA_SNAPSHOTS DBA_SQLSET_PLANS DBA_SQLTUNE_PLANS DBA_SUBPARTITION_TEMPLATES DBA_SUMMARIES DBA_SUMMARY_AGGREGATES DBA_TAB_COLS DBA_TAB_COLUMNS DBA_TAB_PARTITIONS DBA_TAB_SUBPARTITIONS DBA_TRIGGERS DBA_VIEWS DBA_VIEWS_AE 27 rows selected. COLUMN_NAME -----------------------------OTHER DEFAULT_VALUE HASH_EXPRESSION SEARCH_CONDITION COLUMN_EXPRESSION HIGH_VALUE HIGH_VALUE QUERY MEASURE QUERY DATA_DEFAULT SQL_TEXT QUERY_TXT QUERY_TXT QUERY OTHER OTHER HIGH_BOUND QUERY MEASURE DATA_DEFAULT DATA_DEFAULT HIGH_VALUE HIGH_VALUE TRIGGER_BODY TEXT TEXT

The example in Listing 13-6 shows how to write to an external table. Listing 13-6. Populating an External Table SQL> CREATE TABLE test_xt ORGANIZATION EXTERNAL( TYPE ORACLE_DATAPUMP DEFAULT DIRECTORY ext_data_dir LOCATION ('test_xt.dmp')) AS SELECT * FROM scott.dept; Note how the external table creation statement uses the SELECT * FROM clause to write data from the scott.dept table to the external table (file). If your new external table contains some but not all of the columns of the table scott.dept, you use the appropriate SELECT statement instead of the SELECT * FROM statement.

Another frequently asked question is, How do I retrieve the difference between two dates The answer is deceptively simple: you just subtract them. This will return a number representing the number of days between the two dates. Additionally, you have the built-in function MONTHS_BETWEEN that will return a number representing the number of months including fractional months between two dates. Lastly, with the INTERVAL types, you have yet another method to see the elapsed time between two dates. The following SQL query demonstrates the outcome of subtracting two dates (showing the number of days between them), using the MONTHS_BETWEEN function and then the two functions used with INTERVAL types: ops$tkyte@ORA10G> select dt2-dt1 , 2 months_between(dt2,dt1) months_btwn, 3 numtodsinterval(dt2-dt1,'day') days, 4 numtoyminterval(months_between(dt2,dt1),'month') months 5 from (select to_date('29-feb-2000 01:02:03','dd-mon-yyyy hh24:mi:ss') dt1, 6 to_date('15-mar-2001 11:22:33','dd-mon-yyyy hh24:mi:ss') dt2 7 from dual )

Remember that when you load an Oracle table from an external table (data loading), you use the INSERT INTO . . . SELECT clause. When you populate an external table using Oracle table data (data unloading), you use the CREATE TABLE . . . AS SELECT clause.

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