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What type of join is needed when you wish to include rows that do not have matching values?

A. Equi-join

B. Natural join

C. Outer join

D. All of the above

Answer: Option C


This Question Belongs to Database >> Advanced SQL

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Comments ( 1 )

  1. Ayan Ghosh
    Ayan Ghosh :
    3 years ago

    Why we need to create a index if primary key is already present in a table?
    ∆ all of the above
    ∆ index improves the speed of data retrieval operations on a database table
    ∆ indexes are synonyms of a column in a table
    ∆ indexes are special lookup tables that the database search engine can use

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