SQL For Data Analysis > Advanced SQL

Using Index Optimizer with Select Statement

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While an index speeds up SELECT queries and WHERE clauses, it slows down data input in UPDATE and INSERT statements. There is no influence on the data when indexes are created or dropped.

Indexes are used by the query optimizer to speed up query execution. When preparing a SELECT, INSERT SELECT, UPDATE, or DELETE query, the optimizer leverages existing indexes or builds temporary indexes to generate an execution plan. A table's index is a map of keys to row locations.

By creating pointers to where data is stored within a database, indexing makes it easier to query columns. Assume you need to locate a specific piece of data in a vast database. To retrieve this data from the database, the computer will search every row until it finds it.

When referring to mathematical, scientific, or statistical situations, the term "indices" is used. It refers to the numbers, symbols, and figures that are used to compare a value to a standard. The term "indexes" is typically applied to written publications such as bibliographical or citation indexes.

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Khushi Kumari Yadav
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how can i get pdf of this session

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Arvind Kumar
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very nice course for begginer to under stand

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hemant
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Hello sir, explaination is excellent. I have a request please send the db in excel or SQL file

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Juboraj Juboraj
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Explain details & easy to understand.

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Aman Kanaujia
4

All good , but provide the data also for the assignment , Without data the interest is less day by day from the course. So, try to solve this problem as asap.

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Snehil
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Everything is good but keyboard sounds more harsh and overlap your voice whereas this course is best.

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FAROOK MOHAMMAD
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Hello sir, explaination is excellent. I have a request please send the db in excel or SQL file.

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Hari Prakash
4

In SQL Join Function's 2nd video - Teacher's voice dose not match with background content that are plays

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Aakash Mavar
5

Hello sir Mera Abhi graduation hu he Mene Mechanical Engineering BTech ki Hai me Data analysis me Apna career Bana skat ho Kya

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Ashok Kumar Sonkar
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Super Duper Traning

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  1. Getting Started
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  1. Filtering Data using Selection Command
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  14. SQL Practical with Examples
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  15. Assignment : SQL Date and Time
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  7. SQL Joins Practical Session 5
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    10m 17s

  1. What is SQL Index?
    13m 29s
  2. SQL Index types
    24m 50s

  1. Create Tables using Select Statement
    41m 2s
  2. Using Correlated Sub Query, Group By with Select Statement
    40m 2s
  3. Using Group By and Having Clauses with Select Statement
    23m 32s
  4. Using Index Optimizer with Select Statement
    23m 24s
  5. Using Union with Select Statement
    35m 4s
  6. Adding Multiple Records with Insert Statement
    22m 42s
  7. SQL Insert - Considerations and Best Practices
    9m 19s
  8. Insertion from Multiple Tables
    22m 11s
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  11. Assignment : SQL Insert, Update & Delete
    7m 24s

  1. Loading & Connecting Different Files in SQL
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  1. Course Summary
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  1. Interview Questions Part 1
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  1. Career Guideline
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