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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i wan a pdf of this course

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how can i get pdf of this session

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

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

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  1. Create Tables using Select Statement
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  2. Using Correlated Sub Query, Group By with Select Statement
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    23m 32s
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