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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

How IBM Cloudscape supports online and offline Backups

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IBM Cloudscape is a Java-enabled Object Relational Database Management System (ORDBMS). It supports complex SQL statements, transaction management, and provides multi-user support in the Database Management System (DBMS). You can create two types of backups of the Cloudscape database, online backup and offline backup. You can make backups of a database and the log file of the database. When restoring the database, you need to restore the log file and the database. The below picture shows structure of Cloudscape system. You need to understand the structure and contents of a Cloudscape system in order to make backups and restore Cloudscape databases. A Cloudscape system consists of a system directory, one or more Cloudscape databases, and the system properties and configuration settings. A system directory contains a properties file called db2j.properties and an information and error log file called db2j.log. Each database in a Cloudscape system is stored in a subdirectory,