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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 Python 'Hello World' Program Quickly and Run it

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The first Python program looks like the below.  I have explained the steps you need to write your first program in Python. My first program: odbchelper.py You can write your program as nameccheck.py module. if authorsFirstName == 'Irv':       teachingPython = True       print 'Pay attention to his wisdom' How to Run Your Python Program python namecheck.py Sample python program if authorsFirstName == 'Irv':      teachingPython = True    print 'Pay attention to his wisdom' The above if condition checks for first name.  In python '==', means equal to. It makes true to teachingPython .  You can start your python program quickly. Really useful for learning and to use it in projects.