I have a basic query that joins 2 tables (Oracle 9i), it runs fine and all, but I'm trying to fish out duplicate records, and when I resort to having count (column) > 1 the query runs but doesn't return any records.
Is it the fact that I'm joining 2 tables and having count works online on single-table data source, or is there something else at play here.
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Have you ever had to make fundamental changes to a table in Oracle, but haven't been able to get any downtime? I'm talking things like:
* Dropping columns
* Shrinking allocated space
* Removing chained blocks and restoring the PCTFREE
Composite queries are used to retrieve the results from joining multiple queries after applying any filters. UNION, INTERSECT, MINUS, and UNION ALL are some of the operators used to get certain desired results.
Using examples as well as descriptions, step through each of the common simple join types, explaining differences in syntax, differences in expected outputs and showing how the queries run along with the actual outputs based upon a simple set of dem…