1 Chronic sinusitis lasts longer than eight weeks or occurs more than four times per year, with symptoms usually lasting more than 20 days. 2  Sinusitis can be caused by viruses, allergens, pollutants, bacteria, and fungi. 3  Symptoms of sinusitis include. 4  runny or stuffy nose,  postnasal drip,
The information in a ROWID gives Oracle everything he needs to find your row, the disk number, the cylinder, block and offset into the block. The ROWNUM is a pseudo-column, a placeholder that you can reference in SQL*Plus. The ROWNUM can be used to write specialized SQL and tune SQL. In sum, the difference between ROWNUM and ROWID is that ROWNUM is temporary while ROWID is permanent.
A subquery is a SQL query nested inside a larger query. 1  The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. 2  A subquery is usually added within the WHERE Clause of another SQL SELECT statement.  You can use the comparison operators, such as >, <, or =.