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Indexing - True/False question on indexes and query optimization

SQLhard0.6 min readPremium
Frequency
Low
Asked at 1 company
Category
487
questions in SQL
Difficulty Split
130E|271M|86H
in this category
Total Bank
1,863
across 7 categories
Asked at these companies
Myntra
Key Concepts Tested
joinoptimization
Expert AnswerPremium
111 wordsInterview-ready
Indexing true/false: TRUE—Indexes speed up SELECT with WHERE/JOIN on indexed columns; indexes can slow down INSERT/UPDATE/DELETE (writes must update index); unique indexes enforce uniqueness; composite indexes support left-prefix queries. FALSE—Indexes always improve all queries (no: only relevant columns); more indexes always better (no: diminishing returns, write cost); indexes work on all data types equally (some types less effective)....
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