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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

QlikView Server vs Publisher Top Differences Really Useful to Your Project

The differences between QlikView Server and publisher, I have given for your reference. These are related to internally how differ each other.


  • The QVS is a server-side product. It contains an in-memory analytics engine, which handles all client/server communication between a QlikView client (Desktop, IE plugin, AJAX, or Mobile) and the server.
  • The Administrator can have access to the management console to control all aspects of the server deployments (including security, clustering, distribution, etc.) 
  • It also includes a web server to provide front-end access to the documents within.
  • The web server’s user portal is known as Access Point. (It’s important to note that while the QVS contains its web server, one can utilize Microsoft IIS (Internet Information Server) for this purpose, too).
  • The QVS handles client authorization against existing directory providers (Microsoft Active Directory, eDirectory)
  • It also performs read and write to ACLs (access control lists) for QVW documents.

QlikView Server vs Publisher


  1. The QlikView Publisher is a server-side product.
  2. It can use to load data directly from data sources defined via connection strings in the source QVW files. 
  3. It is also used as a distribution service to reduce data and applications from source QVW files based on various rules (such as user authorization or data access privileges) and to distribute these newly-created documents to the appropriate QlikView Servers or as static PDF reports via email.
  4. Data sources that you can access in QlikView are standard ODBC (OLEDBcompliant databases), standard flat files ( Microsoft Excel and XML), and from systems such as SAP NetWeaver, Salesforce.com, and Informatica.

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