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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

How to Write Recursive Shell Script in Bash Terminal

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Here's a simple bash recursive function. To write it, you can use JavaScript and other scripting languages. Below is the example that shows you how to write a recursive function in the bash shell. Recursive function Precisely, calling the same function within it is called the Recursive function. We call itself and its contents.  Moreover, the recursive functions go in the loop due to self-calling. While writing the code, ensure it has a condition that breaks the loop. Recursive logic #!/bin/bash for ((i = 1; i < 65; i++)) { ((arr[i - 1] = i)) } i = 1; key = 8 function linear_search { echo "Element value: ${arr[$i-1]}" if ((arr[i - 1] == key)) then echo "Linear search found $key on attempt $i" return 0 => it breaks the loop else ((i++)) linear_search = > Calling th same script fi } linear_search = > Calling the same script Output Here is the dissection of the output. Displayed the array's elements until match-condition occurs. In the end, a displa