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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
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The Perfect Way to Swap two Strings in Python

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Here is the perfect way swap two strings in python. Without a third variable, you can swap strings in Python. With the swap function, you can achieve this. Here's the sample logic.


swap two strings in python

Swap two strings

Multiple arguments you can use in the same function. Here, a and b are arguments for the swap function. You'll get output as swapped when you use the swap function.


def swap(a, b): 
return b,a 


Logic to swap strings.

i = "Hello world"
j = "This is ApplyBigAnalytics" 

(i, j) = swap(i, j) 

print(i) 
print(j) 


Logic to Swap two numbers.

i = 1 
j = 2 

(i, j) = swap(i,j) 

print(i) 
print(j)


Here is output

This is ApplyBigAnalytics 
Hello world 

2 

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