{"id":25588739,"date":"2024-07-22T10:29:41","date_gmt":"2024-07-22T04:59:41","guid":{"rendered":"https:\/\/entri.app\/blog\/?p=25588739"},"modified":"2025-07-23T12:03:20","modified_gmt":"2025-07-23T06:33:20","slug":"oracle-sql-interview-questions","status":"publish","type":"post","link":"https:\/\/entri.app\/blog\/oracle-sql-interview-questions\/","title":{"rendered":"19 Oracle SQL Interview Questions ( Updated )"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_79_2 counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table of Contents<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-69d3500bbceaf\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-69d3500bbceaf\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/entri.app\/blog\/oracle-sql-interview-questions\/#Oracle_SQL_Interview_Questions\" >Oracle SQL Interview Questions<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/entri.app\/blog\/oracle-sql-interview-questions\/#Top_Oracle_SQL_Interview_Questions_and_Answers\" >Top Oracle SQL Interview Questions and Answers<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/entri.app\/blog\/oracle-sql-interview-questions\/#Oracle_SQL_Interview_Questions_Conclusion\" >Oracle SQL Interview Questions: Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<p><span data-sheets-root=\"1\">Preparing for Oracle SQL interview involves mastering fundamental and advanced concepts. Updated interview questions reflect current industry trends. Candidates should focus on SQL queries and database management. Understanding joins, subqueries, and indexing is crucial. Efficiently managing transactions and error handling is essential. Practice with real-world scenarios enhances problem-solving skills.<\/span><\/p>\n<p style=\"text-align: center;\"><span data-sheets-root=\"1\"><strong><a class=\"in-cell-link\" href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">Experience the power of our full stack development course with a free demo \u2013 enroll now!<\/a><\/strong><br \/>\n<\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Oracle_SQL_Interview_Questions\"><\/span><strong>Oracle SQL Interview Questions<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>About Oracle<\/strong><\/h3>\n<p>Oracle is a leading provider of database management systems. Founded in 1977, it&#8217;s headquartered in California. Oracle offers robust solutions for businesses worldwide. Their products include databases, cloud systems, and software applications. Oracle&#8217;s innovations drive efficiency and scalability in organizations. They are known for their advanced SQL capabilities. Continuous updates keep Oracle at the industry forefront.<\/p>\n<h3><span data-sheets-root=\"1\"><strong>Why Join in Oracle<\/strong><\/span><\/h3>\n<ul>\n<li><strong>Industry Leader<\/strong>: Oracle is a top company in database and software solutions.<\/li>\n<li><strong>Innovative<\/strong>: Work with new technologies like cloud computing and AI.<\/li>\n<li><strong>Career Growth<\/strong>: Plenty of opportunities for professional development and advancement.<\/li>\n<li><strong>Global Impact<\/strong>: Be part of projects that affect industries worldwide.<\/li>\n<li><strong>Diverse Team<\/strong>: Work with people from different cultures and backgrounds.<\/li>\n<li><strong>Great Benefits<\/strong>: Competitive pay, health benefits, and other perks.<\/li>\n<li><strong>Stability<\/strong>: Join a well-established and financially secure company.<\/li>\n<\/ul>\n<h3><strong>Interview Process at Oracle<\/strong><\/h3>\n<div class=\"flex flex-grow flex-col max-w-full\">\n<div class=\"min-h-[20px] text-message flex w-full flex-col items-end gap-2 whitespace-pre-wrap break-words [.text-message+&amp;]:mt-5 overflow-x-auto\" dir=\"auto\" data-message-author-role=\"assistant\" data-message-id=\"1a39cd2d-4571-4f43-83f9-14349b7b6347\">\n<div class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\">\n<div class=\"markdown prose w-full break-words dark:prose-invert light\">\n<p>The Oracle interview process involves 3 to 4 rounds. Here\u2019s a simplified breakdown:<\/p>\n<ol>\n<li><strong>Phone Interview<\/strong>:\n<ul>\n<li>Conducted by a recruiter or HR.<\/li>\n<li>Assesses your background, experience, and interest in the role.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Online Skills Assessment<\/strong>:\n<ul>\n<li>Involves an online test or coding challenges.<\/li>\n<li>Evaluates your technical skills and problem-solving abilities.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Technical Interviews<\/strong>:\n<ul>\n<li><strong>First Technical Interview<\/strong>:\n<ul>\n<li>Conducted by a technical team member.<\/li>\n<li>Includes coding problems and questions about your technical skills.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Second Technical Interview<\/strong>:\n<ul>\n<li>Deeper dive into technical knowledge.<\/li>\n<li>Focuses on complex coding challenges, data structures, algorithms, and system design.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>Final HR Interview<\/strong>:\n<ul>\n<li>Conducted by an HR representative.<\/li>\n<li>Assesses cultural fit, communication skills, and discusses compensation and benefits.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<h3><strong>Oracle SQl Interview Preparation Tips<\/strong><\/h3>\n<h4>1. <strong>Understand the Basics<\/strong><\/h4>\n<ul>\n<li><strong>SQL Syntax<\/strong>: Know basic commands like SELECT, INSERT, UPDATE, and DELETE.<\/li>\n<li><strong>Data Types<\/strong>: Familiarize with data types like NUMBER, VARCHAR2, DATE.<\/li>\n<li><strong>Functions<\/strong>: Learn common functions such as COUNT(), SUM(), AVG(), MIN(), MAX().<\/li>\n<\/ul>\n<h4>2. <strong>Master Advanced SQL Concepts<\/strong><\/h4>\n<ul>\n<li><strong>Joins<\/strong>: Understand INNER JOIN, LEFT JOIN, RIGHT JOIN, FULL JOIN.<\/li>\n<li><strong>Subqueries<\/strong>: Practice correlated and non-correlated subqueries.<\/li>\n<li><strong>Set Operations<\/strong>: Know UNION, INTERSECT, and MINUS.<\/li>\n<li><strong>Indexes<\/strong>: Learn how indexes work and improve performance.<\/li>\n<li><strong>Views<\/strong>: Understand how to create and use views.<\/li>\n<\/ul>\n<h4>3. <strong>Work on Performance Tuning<\/strong><\/h4>\n<ul>\n<li><strong>Explain Plan<\/strong>: Use EXPLAIN PLAN to optimize queries.<\/li>\n<li><strong>Indexing Strategies<\/strong>: Know different types of indexes and when to use them.<\/li>\n<li><strong>Query Optimization<\/strong>: Write efficient queries and use hints.<\/li>\n<\/ul>\n<h4>4. <strong>Practice Real-World Scenarios<\/strong><\/h4>\n<ul>\n<li><strong>Problem-Solving<\/strong>: Solve SQL problems from coding platforms and past interviews.<\/li>\n<li><strong>Case Studies<\/strong>: Study SQL use in reporting, data analysis, and transactions.<\/li>\n<li><strong>Mock Interviews<\/strong>: Simulate interviews and get feedback.<\/li>\n<\/ul>\n<h4>5. <strong>Understand Database Management<\/strong><\/h4>\n<ul>\n<li><strong>Transactions<\/strong>: Learn COMMIT, ROLLBACK, and SAVEPOINT.<\/li>\n<li><strong>Concurrency Control<\/strong>: Understand locking, deadlocks, and isolation levels.<\/li>\n<li><strong>Backup and Recovery<\/strong>: Know basics of backup, restore, and recovery.<\/li>\n<\/ul>\n<h4>6. <strong>Stay Updated with New Features<\/strong><\/h4>\n<ul>\n<li><strong>Oracle Versions<\/strong>: Keep up with features in the latest Oracle versions.<\/li>\n<li><strong>Documentation<\/strong>: Review Oracle documentation and release notes.<\/li>\n<\/ul>\n<h4>7. <strong>Utilize Online Resources<\/strong><\/h4>\n<ul>\n<li><strong>Official Documentation<\/strong>: Refer to Oracle&#8217;s official docs for detailed info.<\/li>\n<li><strong>Online Courses<\/strong>: Enroll in courses and watch tutorials.<\/li>\n<li><strong>Community and Forums<\/strong>: Engage in forums like Stack Overflow and Oracle Community.<\/li>\n<\/ul>\n<h4>8. <strong>Hands-On Practice<\/strong><\/h4>\n<ul>\n<li><strong>Oracle Live SQL<\/strong>: Practice with Oracle&#8217;s Live SQL tool.<\/li>\n<li><strong>Sample Databases<\/strong>: Use sample databases like HR or SCOTT.<\/li>\n<li><strong>Projects<\/strong>: Build or contribute to projects to apply SQL skills.<\/li>\n<\/ul>\n<h2><span class=\"ez-toc-section\" id=\"Top_Oracle_SQL_Interview_Questions_and_Answers\"><\/span><strong>Top Oracle SQL Interview Questions and Answers<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><strong>Q. Explain the difference between RANK and DENSE_RANK functions in Oracle SQL.<\/strong><\/h3>\n<p><strong>Difference between RANK and DENSE_RANK functions in Oracle SQL:<\/strong><\/p>\n<ul>\n<li><strong>RANK:<\/strong>\n<ul>\n<li>Assigns the same rank to rows with the same values.<\/li>\n<li>Skips the subsequent rank(s) when duplicates exist.<\/li>\n<\/ul>\n<\/li>\n<li><strong>DENSE_RANK:<\/strong>\n<ul>\n<li>Provides consecutive ranking without gaps, even when duplicate values exist.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q.\u00a0What is the purpose of the UNION operator in Oracle SQL?<\/strong><\/h3>\n<p><strong>Purpose of the UNION operator in Oracle SQL:<\/strong><\/p>\n<ul>\n<li>Combines the results of two or more SELECT queries into a single result set.<\/li>\n<li>Merges rows from different queries.<\/li>\n<li>Removes duplicate rows to present a unified result.<\/li>\n<\/ul>\n<h3><strong>Q.\u00a0Name one advantage of using indexes in a database.<\/strong><\/h3>\n<p><strong>Advantage of using indexes in a database:<\/strong><\/p>\n<ul>\n<li>Improves query performance by enabling quicker data retrieval.<\/li>\n<li>Reduces the need for full table scans.<\/li>\n<\/ul>\n<h3><strong>Q.\u00a0Differentiate between the\u00a0<i>WHERE<\/i>\u00a0clause and the\u00a0<i>HAVING<\/i>\u00a0clause in Oracle SQL.\u00a0<\/strong><\/h3>\n<p><strong>Difference between the WHERE clause and the HAVING clause in Oracle SQL:<\/strong><\/p>\n<ul>\n<li><strong>WHERE clause:<\/strong>\n<ul>\n<li>Filters rows before grouping.<\/li>\n<li>Applies conditions to individual rows before they are included in the result set.<\/li>\n<\/ul>\n<\/li>\n<li><strong>HAVING clause:<\/strong>\n<ul>\n<li>Filters data after grouping (post-aggregation).<\/li>\n<li>Applies conditions to grouped rows.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. How does the Oracle Query Optimizer determine an execution plan for a query?<\/strong><\/h3>\n<p>How the Oracle Query Optimizer determines an execution plan for a query:<\/p>\n<ul>\n<li>Uses heuristics (rules of thumb) and statistics.<\/li>\n<li>Considers available indexes, table size, and query complexity to decide the most efficient execution plan.<\/li>\n<\/ul>\n<h3><strong>Q. What is the key difference between ROW-level and STATEMENT-level triggers in Oracle?\u00a0<\/strong><\/h3>\n<p><strong>Key difference between ROW-level and STATEMENT-level triggers in Oracle:<\/strong><\/p>\n<ul>\n<li><strong>ROW-level triggers:<\/strong>\n<ul>\n<li>Fire once for each affected row.<\/li>\n<li>Allow row-specific actions.<\/li>\n<\/ul>\n<\/li>\n<li><strong>STATEMENT-level triggers:<\/strong>\n<ul>\n<li>Execute only once for the entire statement.<\/li>\n<li>Suitable for actions that don\u2019t depend on individual rows.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q.\u00a0What do the\u00a0<i>COMMIT<\/i>\u00a0and\u00a0<i>ROLLBACK<\/i>\u00a0statements in Oracle SQL do?<\/strong><\/h3>\n<p><strong>COMMIT and ROLLBACK statements in Oracle SQL:<\/strong><\/p>\n<ul>\n<li><strong>COMMIT:<\/strong>\n<ul>\n<li>Saves all changes made in a transaction to the database.<\/li>\n<li>Makes changes permanent.<\/li>\n<\/ul>\n<\/li>\n<li><strong>ROLLBACK:<\/strong>\n<ul>\n<li>Undoes the changes in a transaction.<\/li>\n<li>Reverts the database to its pre-transaction state.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. What are some advantages of using bind variables in Oracle SQL?<\/strong><\/h3>\n<p><strong>Advantages of using bind variables in Oracle SQL:<\/strong><\/p>\n<ul>\n<li>Improve performance through caching and reusing.<\/li>\n<li>Reduce the need for parsing.<\/li>\n<li>Protect against SQL injection attacks.<\/li>\n<li>Require minimal maintenance.<\/li>\n<li>Reduce memory usage.<\/li>\n<\/ul>\n<h3><strong>Q. Differentiate between VARCHAR and VARCHAR2 data types.<\/strong><\/h3>\n<p><strong>Difference between VARCHAR and VARCHAR2 data types:<\/strong><\/p>\n<ul>\n<li><strong>VARCHAR:<\/strong>\n<ul>\n<li>Standard SQL data type.<\/li>\n<li>Works across different relational database systems.<\/li>\n<\/ul>\n<\/li>\n<li><strong>VARCHAR2:<\/strong>\n<ul>\n<li>Specific to Oracle.<\/li>\n<li>More storage-efficient.<\/li>\n<li>Does not store trailing spaces, avoiding unexpected results when comparing strings.<\/li>\n<li>May not be supported by non-Oracle database systems.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. How would you explain database roles and privileges in Oracle SQL security?<\/strong><\/h3>\n<p><strong>Database roles and privileges in Oracle SQL security:<\/strong><\/p>\n<ul>\n<li><strong>Database roles:<\/strong>\n<ul>\n<li>Named groups of related privileges.<\/li>\n<li>Simplify security management by allowing multiple privileges to be granted or revoked as a single unit.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Privileges:<\/strong>\n<ul>\n<li><strong>GRANT statement:<\/strong> Used to grant privileges.<\/li>\n<li><strong>REVOKE statement:<\/strong> Used to revoke privileges.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. Write an Oracle SQL query to find the average salary of employees within each department.<\/strong><\/h3>\n<p>Query to find the average salary of employees within each department:<\/p>\n<p style=\"padding-left: 40px;\">SELECT department_id, AVG(salary) AS average_salary<br \/>\nFROM employees<br \/>\nGROUP BY department_id;<\/p>\n<h3><strong>Q. Write an Oracle SQL query to find employees who earn more than their managers.<\/strong><\/h3>\n<p>Query to find employees who earn more than their managers:<\/p>\n<p style=\"padding-left: 40px;\">SELECT emp.*<br \/>\nFROM Employee emp<br \/>\nINNER JOIN Employee mgr ON emp.manager_id = mgr.employee_id<br \/>\nWHERE emp.salary &gt; mgr.salary;<\/p>\n<h3><strong>Q. How would you update the <i>status<\/i>\u00a0column of the\u00a0<i>orders<\/i>\u00a0table to set all orders with a total amount greater than 1,000 to\u00a0<i>High Value<\/i>?<\/strong><\/h3>\n<p>Update the status column of the orders table for orders with a total amount greater than 1,000:<\/p>\n<p style=\"padding-left: 40px;\">UPDATE orders<br \/>\nSET status = &#8216;High Value&#8217;<br \/>\nWHERE total_amount &gt; 1000;<\/p>\n<h3><strong>Q. Write an Oracle SQL query to get the date and time of the last 10 logins for a specific user.<\/strong><\/h3>\n<p>Query to get the date and time of the last 10 logins for a specific user:<\/p>\n<p style=\"padding-left: 40px;\">SELECT login_time<br \/>\nFROM UserLogins<br \/>\nWHERE user_id = &#8216;specific_user_id&#8217;<br \/>\nORDER BY login_time DESC<br \/>\nFETCH FIRST 10 ROWS ONLY;<\/p>\n<h3><strong>Q. Retrieve the top five highest-rated products based on customer reviews from the <i>product_reviews<\/i>\u00a0table.<\/strong><\/h3>\n<p style=\"padding-left: 40px;\">SELECT product_id, product_name, AVG(review_rating) AS average_rating<br \/>\nFROM product_reviews<br \/>\nGROUP BY product_id, product_name<br \/>\nORDER BY average_rating DESC<br \/>\nFETCH FIRST 5 ROWS ONLY;<\/p>\n<p style=\"text-align: center;\"><span data-sheets-root=\"1\"><strong><a class=\"in-cell-link\" href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">Experience the power of our full stack development course with a free demo \u2013 enroll now!<\/a><\/strong><\/span><\/p>\n<h3><strong>Q. Calculate the total revenue generated by each customer in the last three months.<\/strong><\/h3>\n<p style=\"padding-left: 40px;\">SELECT customer_id, SUM(revenue) AS total_revenue<br \/>\nFROM sales<br \/>\nWHERE transaction_date &gt;= TRUNC(SYSDATE) &#8211; INTERVAL &#8216;3&#8217; MONTH<br \/>\nGROUP BY customer_id;<\/p>\n<h3><strong>Q. What is SQL (Structured Query Language)?<\/strong><\/h3>\n<p><strong>SQL (Structured Query Language):<\/strong><\/p>\n<ul>\n<li>A standard programming language designed for managing and manipulating relational databases.<\/li>\n<li><strong>Primary Uses:<\/strong>\n<ul>\n<li><strong>Querying Data:<\/strong> Retrieve specific data from a database.<\/li>\n<li><strong>Updating Records:<\/strong> Modify existing data within the database.<\/li>\n<li><strong>Inserting Data:<\/strong> Add new data into the database.<\/li>\n<li><strong>Deleting Data:<\/strong> Remove data from the database.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Managing Database Objects:<\/strong>\n<ul>\n<li><strong>Tables:<\/strong> Define and alter the structure of tables.<\/li>\n<li><strong>Views:<\/strong> Create virtual tables based on queries.<\/li>\n<li><strong>Indexes:<\/strong> Enhance the performance of data retrieval operations.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. What are the different types of SQL commands?<\/strong><\/h3>\n<h3>Different Types of SQL Commands<\/h3>\n<p>SQL commands can be categorized into the following types:<\/p>\n<ul>\n<li><strong>DDL (Data Definition Language):<\/strong>\n<ul>\n<li>Used to define and manage all database objects.<\/li>\n<li><strong>Commands:<\/strong>\n<ul>\n<li>CREATE:\u00a0Creates a new table, view, or other object in the database.<\/li>\n<li>ALTER: Modifies an existing database object.<\/li>\n<li>DROP: Deletes a database object.<\/li>\n<li>TRUNCATE:\u00a0Removes all records from a table, including all spaces allocated for the records.<\/li>\n<li>RENAME: Renames a database object.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>DML (Data Manipulation Language):<\/strong>\n<ul>\n<li>Used for managing data within schema objects.<\/li>\n<li><strong>Commands:<\/strong>\n<ul>\n<li>SELECT:\u00a0Retrieves data from the database.<\/li>\n<li>INSERT:\u00a0Adds new data into the database.<\/li>\n<li>UPDATE:\u00a0Modifies existing data in the database.<\/li>\n<li>DELETE:\u00a0Removes data from the database.<\/li>\n<li>MERGE: Combines INSERT and UPDATE in a single statement.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>DCL (Data Control Language):<\/strong>\n<ul>\n<li>Used to control access to data in the database.<\/li>\n<li><strong>Commands:<\/strong>\n<ul>\n<li>GRANT:\u00a0Gives user access privileges to the database.<\/li>\n<li>REVOKE:\u00a0Withdraws user access privileges given by the GRANT command.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<li><strong>TCL (Transaction Control Language):<\/strong>\n<ul>\n<li>Used to manage transactions in the database.<\/li>\n<li><strong>Commands:<\/strong>\n<ul>\n<li>COMMIT:\u00a0Saves all changes made in the current transaction.<\/li>\n<li>ROLLBACK:\u00a0Undoes changes made in the current transaction.<\/li>\n<li>SAVEPOINT: Sets a point within a transaction to which you can later roll back.<\/li>\n<li>SET TRANSACTION:\u00a0Sets the properties for the current transaction.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3><strong>Q. What is an Aggregate Function?<\/strong><\/h3>\n<p>Aggregate functions in SQL perform a calculation on a set of values and return a single value. They are commonly used in conjunction with the GROUP BY\u00a0clause to perform calculations on each group of values in a dataset. Aggregate functions are useful for summarizing data and providing statistical insights.<\/p>\n<p style=\"text-align: center;\"><span data-sheets-root=\"1\"><strong><a class=\"in-cell-link\" href=\"https:\/\/entri.app\/course\/full-stack-developer-course\/\" target=\"_blank\" rel=\"noopener\">Experience the power of our full stack development course with a free demo \u2013 enroll now!<\/a><\/strong><\/span><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Oracle_SQL_Interview_Questions_Conclusion\"><\/span><strong>Oracle SQL Interview Questions: Conclusion<\/strong><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Oracle being one of the most sort after companies by the aspirants is very difficult to get through the interview. Going through the above sample interview questions will give you an idea about the types of questions asked in the Oracle SQL Interview. You can use this blog to crack the interview with ease.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Preparing for Oracle SQL interview involves mastering fundamental and advanced concepts. Updated interview questions reflect current industry trends. Candidates should focus on SQL queries and database management. Understanding joins, subqueries, and indexing is crucial. Efficiently managing transactions and error handling is essential. Practice with real-world scenarios enhances problem-solving skills. Experience the power of our full [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":25588741,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[802,1903,1841,1926],"tags":[],"class_list":["post-25588739","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-articles","category-coding","category-entri-skilling","category-full-stack-web-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>19 Oracle SQL Interview Questions ( Updated ) - Entri Blog<\/title>\n<meta name=\"description\" content=\"Preparing for Oracle SQL interview involves mastering fundamental and advanced concepts. 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