Showing posts with the label Linux certification

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SQL Interview Success: Unlocking the Top 5 Frequently Asked Queries

 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

Linux Must Read Course Contents

The complete syllabus for the Linux certification course you need to know before start preparation for the test. List of Course Contents The Linux community and a career in open source Finding your way on a Linux system The power of the command line The Linux operating system Security and file permissions Topic 1: The Linux Community and a Career in Open Source (weight: 7) 1.1 Linux Evolution and Popular Operating Systems Weight: 2 Description: Knowledge of Linux development and major distributions. Key Knowledge Areas: Open Source Philosophy Distributions Embedded Systems The following is a partial list of the used files, terms and utilities: Android Debian, Ubuntu (LTS) CentOS, openSUSE, Red Hat Linux Mint, Scientific Linux 1.2 Major Open Source Applications Weight: 2 Description: Awareness of major applications as well as their uses and development. Key Knowledge Areas: Desktop Applications Server Applications Development Languages Package Management