People in the Blue Zones eat nuts two to four times each week. Red Wine: A daily glass of red wine is also believed to help increase longevity. Researchers believe it is because it helps combat both stress and chronic inflammation in the body.
Answer: There are a few ways to verify whether a table exists within Oracle. One way is to describe it to check if the table exists: SQL> desc mytable. Another is to select the first row to check that the table exists (hey it may have millions of rows!): SQL> select * from mytable where rownum=1; At bare minimum, you will get a response of 0 rows selected which means the table exists, but there is no data in the table. You can also check the data dictionary to see if a table exists: SQL> select table_name from user_tables where table_name='MYTABLE';
Hive is a popular tool to query data in HDFS. Oracle SQL Connector for HDFS can read data directly from a Hive table in version 2.0. Also, the command-line tool of Oracle SQL Connector for HDFS has been simplified greatly. The connector only needs the Hive table and Hive database name, specified as Hadoop configuration properties, to access data from a Hive table. oracle.hadoop.exttab.sourceType=hive oracle.hadoop.exttab.hive.tableName. oracle.hadoop.exttab.hive.databaseName. A command-line tool creates an external table in Oracle Database. This external table is queried to access data in the Hive table. Since an external table can be queried like any other table in the database, Oracle SQL functionality is available to query the Hive table.