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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 Send Shell script Result to Email

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The shell-script result you can send to email. Below, you will find the steps you need to do it. There are two steps and both will help you know the entire process.

Sending shell-script results to email

  1. Creating shell-script
  2. Sending the result to email


Bash script output to email

1. Creating shell-script


Create an empty script

Create test1.sh script using the vi command with the Sudo command.

$sudo vi test1.sh


Write the first line in the script

#!/bin/bash
exec > out1.txt 2>&1


Add logic in the shell script

#!/bin/bash
exec > out1.txt 2>&1

echo" Here is my logic"


Provide executable permissions to your script

$ sudo chmod +x test1.sh


Run your script using the command below

$ ./test1.sh


Verify the output

$ cat out1.txt


2. Sending result to email

Use the below command to send the output (result) to email.


$ mail <<output file path name>> abc@gmail.com


Bottom-line

These steps are helpful to send the output to an email. 


References

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