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.
SQL - Alias Syntax. You can rename a table or a column temporarily by giving another name known as alias. The use of table aliases means to rename a table in a particular SQL statement. The renaming is a temporary change and the actual table name does not change in the database. The column aliases are used to rename a table's columns for the purpose of a particular SQL query.