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';
Problem of duplicates in database arise when you don't have a primary key or unique key on database and that's why its recommended to have a key column in table. Anyway its easy to find duplicate records in table by using group by clause of ANSI SQL.n order to find duplicate records in database table you need to confirm definition of duplicates, for example in below contact table which is suppose to store name and phone number of contact, a record is considered to be duplicate if both name and phone number is same but unique if either of them varies.