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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

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 Here are the five top commonly asked SQL queries in the interviews. These you can expect in Data Analyst, or, Data Engineer interviews. Top SQL Queries for Interviews 01. Joins The commonly asked question pertains to providing two tables, determining the number of rows that will return on various join types, and the resultant. Table1 -------- id ---- 1 1 2 3 Table2 -------- id ---- 1 3 1 NULL Output ------- Inner join --------------- 5 rows will return The result will be: =============== 1  1 1   1 1   1 1    1 3    3 02. Substring and Concat Here, we need to write an SQL query to make the upper case of the first letter and the small case of the remaining letter. Table1 ------ ename ===== raJu venKat kRIshna Solution: ========== SELECT CONCAT(UPPER(SUBSTRING(name, 1, 1)), LOWER(SUBSTRING(name, 2))) AS capitalized_name FROM Table1; 03. Case statement SQL Query ========= SELECT Code1, Code2,      CASE         WHEN Code1 = 'A' AND Code2 = 'AA' THEN "A" | "A

SMAC-Persistent Systems

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The global leader in software product and technology services, today announced it has entered into a definitive agreement to acquire privately-held  CloudSquads , an innovative consultancy that has created social communities for over  70 global companies . CloudSquads deploys, integrates and runs social communities on all leading  social customer platforms .  Terms of the agreement were not disclosed and are subject to certain closing conditions which are expected to be completed in the coming financial quarter. According to  Forrester  Research Senior Analyst, Kim Celestre in her July 9, 2013 blog post entitled Just Published: The Forrester WAVE: Social Depth Platforms, Q3 2013, “Social media has transformed the way that buyers discover, explore, and engage with a brand. As a result, many marketers have invested in establishing a presence on popular social networks like Facebook and Twitter yet are struggling with how to convert interactions on these social networks to a purchase.