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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

10 Top Unix Disk Space Quiz Questions

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I have listed 10 top Quiz questions on UNIX disk space. These questions help you to understand about disk-related concepts quickly. Unix Disk Space QUIZ Questions. Below listed 10 quiz questions help you to know the disk-space related concepts. 1. All devices are considered as files in Unix. Yes 2. All device files are stored in /etc or in its subdirectories. No 3. CD-ROM is a character device. No 4. The printer is a character device. Yes 5. The minor number represents the type of device. No 6. The dd command is used for copying data from one medium to another. Yes 7. The term bs in the dd command stands for block size. Yes 8. The du utility displays complete information about the usage of disk space by each file and directory. Yes 9. By default, the du command displays information in terms of 1024-byte blocks. No 10. The df command reports only the free disk space of the file system installed on our machines. Yes Keep Reading Top vi Editor Commands for Ubuntu