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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
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For a trainee software engineer who is a fresh college pass out the salary falls somewhere between INR 1.5 to 2.5 Lakhs per Annum. This increases as one climbs up the career ladder – with a figure of INR 3.0 to 6.0 Lakhs per Annum for software engineer/programmer analysts, INR 4.5 – 10.0 Lakhs per Annum for senior software engineer, INR 6.0 – 13.0 Lakhs per Annum for project lead and INR 8.0 – 19.0 Lakhs per Annum for program manager.

 In addition to the high salaries, there is lot of international assignments which requires travel to different countries for the talented ones. One has to keep oneself constantly updated with the newer skills and emerging technologies so as not to become an obsolete resource.

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