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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 Multiline Commenting Ideas in Python

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Here are two ways you can comment out multiple lines in python.

Python Multiline Comments

These are two popular methods Viz Backslash and Triple quote methods.

1. Backslash method

>>> s = "This is a test of the emergency broadcast system" \
… " and it will display an emergency if you put a line of
text" \
… " that is more than 80 characters on a single line"


>>> print(s)

This is a test of the emergency broadcast system and it will
display an emergency if you put a line of text that is more
than 80 characters on a single line


Split Strings

2. Triple quote method

>>> s1 = """ This is a test of the emergency broadcast
system.
… and it will display an emergency if you put a line of text
… that is more than 80 characters on a single line
… """

>>> print(s1)

This is a test of the emergency broadcast system.
and it will display an emergency if you put a line of text
that is more than 80 characters on a single line


Summary

  • You can use two methods to split the string
  • The Triple quote method is easier to use

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