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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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2 Best Ways to Concatenate Strings in Python

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Concatenation of strings in Python is possible by using the plus and join method. You can also do it in other ways. But in my point of view, these two are the best methods.


best ways concatenate string python

What are Strings?


A string represents in quotes. Let us see the data. It can have all kinds of data. A lot you can do by manipulating strings. Concatenation is one.


Example for strings 

Stringa='Uncle'
Stringb='is'
Stringc='Married'


Above example, you can see three strings. To make all these strings into a single, you need the concept of concatenation.

What is string concatenation?


String concatenation is a frequent activity in data science. Knowing this concept is helpful in your project and interviews as well.

You can do it using the two best methods. One is you can use plus operator. For the other one, you can use the join method.


#1: Using the plus operator


Stringa='Uncle'
Stringb='is'
Stringc='Married'
print(Stringa + ' ' + Stringb + ' ' + Stringc)


Result:

Uncle is Married


#2: Using the join method with separator.


Stringa='Uncle'
Stringb='is'
Stringc='Married'
a=' '.join([Stringa, Stringb, Stringc])
print(a)


Result:

Uncle is Married


Reference books


Reference links

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