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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

Top Tips You Need to Create Mobile Apps

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Before you start creating mobile applications, you need to understand two things. There are two mobile application types. Namely Native and Web applications. Mobile applications are two types.Those are Native and Web applications.   Photo Credit: Srini Native applications Each mobile operating system you need to create one version. Native applications are platform dependent. The disadvantage is you need to create multiple versions. Develop apps only on that platform These apps not portable Web applications The web applications are platform independent. They work for all mobile operating systems. These applications are browsable using any popular browsers. These apps are browsable from any popular web browsers 4 Top Mobile Platforms iOS  Android  Windows Phone 7  Blackberry OS  4 Top Tablet Platforms iOS  Android  Blackberry OS  Windows 8 Related Learn Android app quickly and your own time