It is a must to know the order in which the SQL clauses are executed. This is demonstrated with an example below in #5. Have this order of execution visibly pinned and understood.
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Home › Java & Big Data Interview FAQs › 300+ Big Data Interview FAQs 🔥 › Archive for Big Data – 01: SQL
Blog Archives
00: 25+ SQL interview questions & answers – beginner
SQL interview Questions & Answers is a must for any developer as all non-trivial applications need to talk to a database with CRUD operations. Q3 – Q15 are very popular with the interviewers.
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00: 25+ SQL interview questions & answers – intermediate to experienced
This continues 25+ SQL interview questions & answers – beginner Q16. Why do you have CASE statements in SQL? A16. … Read more ›...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs01: 50+ SQL scenarios based interview Q&As on identifying & deleting duplicate records
50+ SQL interview questions and answers to solve real business scenarios. SQL is widely used in building microservices & Big Data projects. Learning SQL syntax is easy, but being able to convert a given business requirement into a query takes lots of practice.
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02: 50+ SQL scenarios based interview Q&As on joins, CDC and recursive CTE
This extends 50+ SQL scenarios based interview questions answered on identifying & deleting duplicate records. You practice these in SQLs by setting up the data on db-fiddle MySQL V8.0 or...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs02: SQL analytic functions interview questions – Part 1
Data Engineers & analysts must know the analytic functions applied over a window of rows is a powerful tool to analyse the data. This post compliments “Apache Spark window functions”...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs02: SQL analytic functions interview questions – Part 2
This extends SQL window function for analytical queries interview questions – Part 1 Analytic function construct The analytic function names can be RANK(), … Read more ›...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs02: SQL analytic functions interview questions – Part 3
This extends SQL analytic functions interview questions – Part 2 and SQL analytic functions interview questions – Part 1. The below example was created in IMPALA SQL engine with Common...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs03: 50+ SQL scenarios based interview Q&As on familiarising various features
This extends 50+ SQL scenarios based interview Q&As on joins, CDC and recursive CTE. Q01 In What order the SELECT SQL statements are executed? … Read more ›...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs04: 50+ SQL scenarios based interview Q&As on Nth value
This SQL scenarios based interview questions & answers focus on nth highest value or nth lowest value. These examples were done on MySQL v8.0 at www.db-fiddle.com.
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05: 50+ SQL scenarios based interview Q&As on N items per group
This extends 15+ SQL scenarios based interview Q&As on Nth value – part 4. This SQL scenarios based interview questions & answers focus on N items per group. … Read...
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs06: 50+ SQL scenarios based interview Q&As on unique N items per group
This extends 15+ SQL scenarios based interview Q&As on N items per group – part 5 This SQL scenarios based interview questions & answers focus on N items per group....
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Login Register 100+ Free Java interview FAQs 100+ Free Big Data interview FAQs07: 50+ SQL scenarios based interview Q&As on Pivot Vs. Unpivot
Q01 Often you will have a requirement to report on a certain dimension, which requires you to convert rows into columns or columns into rows. How will you go about accomplishing this using SQL?
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