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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

IoT real concept for auto insurance

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IoT in insurance is a connected car which helps transforming how insurance premiums can be calculated. With the help of a small wireless device that plugs into the diagnostic port, Metromile offers a “per-mile” usage-based insurance. Often, low-mileage drivers overpay for insurance because they’re subsidizing those who drive the most. Insurance Calculation But since the number one risk indicator for drivers is time on the road, Metromile can offer insurance pro-rata by tracking the miles driven. #Mile-based insurance an application of IoT: According to wiki: Usage-based insurance (UBI) -also known as pay as you drive (PAYD) and pay how you drive (PHYD) and mile-based auto insurance   is a type of vehicle insurance whereby the costs are dependent upon the type of vehicle used, measured against time, distance, behavior, and place. This differs from traditional insurance, which attempts to differentiate and reward "safe" drivers, giving them lower premiums and/or a

Protocols: Top 6 Key Parts

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In telecommunications, a protocol is a system of rules that allow two or more entities of a communications system to transmit information. The medium can be any kind of entity.

IoT Architecture for very new developers: part 1 of 6

What is the architecture of internet of things -The three-layer DCM classification is more about the IoT value chain than its system architecture at run time. I hope you enjoyed with my previous  post-5  on IOT. For system architecture, some have divided the IoT system into as many as nine layers, from bottom to top: devices connectivity data collection communication device management. data rules administration applications integration While large companies such as IBM, Oracle, Microsoft, and others have comprehensive solutions, products, and services that cover almost the entire value chain. Recommendation for you:     Part-2  |  Part-1 Broadly IOT architecture can be classified as three layers: Device Layer Communication Layer Mangement Layer Device Layer: Devices or assets can be categorized as two groups: those that have inherent intelligence such as electric meters or heating, ventilation, and air-conditioning (HVAC) controllers, and those tha