DML command and Index
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Data manipulation commands are used to manage data. Using DML command, you can create new records, update records and delete records. The following commands fall in this category.
SELECT - retrieve data from the a database
INSERT - insert data into a table
UPDATE - updates existing data within a table
DELETE - deletes all records from a table.
What is an Index?
Index in oracle helps to trace the information faster just like an index in a book. Index entries keep information about the columns that are part of the index in a sorted order. If you query data with an index, the data retrieval is much faster.
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