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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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How to Use For loop List Option Quickly

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For loop is main concept in Python programming. Out of all the For Loop options, the list option is so popular. If you know, how to use this concept, you can write any number of programs quickly and with less effort.

Using for loop you can get index for list items. You can print list elements using for loop.

If you take any language, the loops play a vital role.
for loop using list in python

How to Use For Loop

When you want to deal with data of multiple values, you need loops. So, For Loop is so famous because, you can control multiple input values.

Syntax to Write For Loop

       
for i in my_list:
    print(i)

The 'i' says variable that represents value in the 'my_list'. The for helps to iterate the list values one by one.

Example Program For Loop List in Python 

           my_list=[2,3,4]
           for i in my_list:
                print(i)

Result 

           2
           3
           4

How to create Multiplication Table using Python For-Loop List Option.

Function to create table
Function to create table

Result of function that generated Multiplication Table 

 
how to create table in python
Creating multiplication table in python

Bottom Line

  1. You can use for loop to calculate Factorial and listing values one by one.
  2. Your input data contains multiple values, then For loop is so useful.

References

  1. SanFoundary for Python Sample Programs

Top Courses

Top Books
  1. Taming Python by Programming

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