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  • Indexes in SQL

    @HIMANSHU
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    To provide searching optimization we need to create indexes in the table. By default primary key is already indexed


    For searching by other columns apart from primary key we will create index into them for faster searching.


    Ex: CREATE INDEX nameidx
      ON student (name)


    Indexes can be of Unique type . You cannot have duplicate values in that index


    Ex: CREATE UNIQUE INDEX uninameidx
      ON student (name)


    We also can have multiple column indexes


    Ex: CREATE INDEX mulnameidx
      ON student (LastName, FirstName)
    SQL
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