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...
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...
1) Select fields instead of using SELECT *. The “*” is used as a short hand to query all available data from a table. … Read more ›...
Q01 How will you go about identifying duplicate records in a table?
A01 This is a very popular interview question because there are many approaches,
…
This extends Q01 – Q03 at 15+ SQL scenarios based interview questions answered. Q04 When you have a table that maintains history of record updates, … Read more ›...
This extends 15+ SQL scenarios based interview Q&As – Part 2. Q07 In What order the SELECT SQL statements are executed? … Read more ›...
Common Table Expressions or CTE’s for short are used in SQL to simplify complex joins and subqueries, and to provide a means to query hierarchical data such as an organisational...
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”...
This extends SQL window function for analytical queries interview questions – Part 1 Analytic function construct The analytic function names can be RANK(), … Read more ›...
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...
Q1. What is a temporal table? A1. Temporal tables store and maintain information with respect to time. … Read more ›...