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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

JavaScript Vs JSON Top Differences

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Today I woke up after my night sleep, and quickly I completed my daily routines. I thought a few minutes to write useful posts for my readers. I decided to write the differences between JavaScript and JSON. JavaScript Vs JSON Top Differences JSON Quick Insights JSON is simply a data-interchange format and, therefore, does not directly require the immediate knowledge of the JavaScript language. JSON a subset of the JavaScript language. Data exchange can occur between both browser and server and even server to server. The file extension is .json. You can structure the JSON as below: A collection of name/value pairs. An ordered list of values. An introduction to JSON read here JavaScript Quick Insights JavaScript is a text-based scripting language, whereby sequences of Unicode characters strung together. JavaScript supports two different types of data types. Primitive and non-primitive. Primitive data types the best example is the Object. The non-primitive examples are number, string, Boo