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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 Easy Way to Split String Python Partition Method

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Here's a way without the Split function you can split (or extract) a substring. In Python the method is Partition. You'll find here how to use this method with an example.  How to Split the string using Partition method   Returns Left side part Example-1 my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.partition('|')[0] print(my_partition) Output |10||123456.25| ** Process exited - Return Code: 0 ** Press Enter to exit terminal Example-2 Returns from the separator to last of the string. my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.partition('|')[-1] print(my_partition) Output |10||123456.25| ** Process exited - Return Code: 0 ** Press Enter to exit terminal The use of Rpartition to split a string in Python Example-1 Returns except right side last separator. my_string='ABCDEFGH||10||123456.25|' my_partition=my_string.rpartition('|')[0] print(my_partition) Output ABCDEFGH||10||123456.25 ** Process exited -
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