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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

New IT Job Roles So Popular to Read

The popular job roles you can read today. These are new in the industry. Knowing is not harmful. You will get ideas on achieving these roles. E-Commerce Business Analyst It involves supporting the development of e-commerce solutions. This person should possess strong analytical, organizational and communication skills and will have demonstrated the ability to collaborate within a team environment. Virtualization Engineer/Architect It refers to the agile provisioning of converged storage, computes and network resources. It requires knowledge of how to take a cluster of physical servers and make them virtual machines, it also extends to network and storage virtualization CRM Expert Customer Relationship Management (CRM) experts need to work on complex CRM applications and their role includes programming, project management, project development, systems configuration, and development. Read more