Preparing for SQL Query interview questions for experienced developers will help you land your dream job in any top tech or FAANG company. The SQL database market is expanding. Microsoft, Oracle, IBM, Accenture, and other companies hire experienced SQL professionals. They seek candidates who will be valuable assets to their organizations.
To crack the SQL interviews, you must have programming skills and be able to handle large database management systems. The interviewer will ask questions based on coding, your experience in SQL, challenges faced, and possibly ask the basics in SQL to test your fundamental understanding. Read on to discover the most anticipated SQL Query interview questions for experienced professionals.
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This is one of the commonly asked SQL Query interview questions for experienced professionals. You must know that SQL injection is a widely used hacking technique by hackers to steal data from databases and tables. The hacker would add some malicious code to steal your credentials if you go to a website and give in your user credentials, inserted in the form of tables. It is better to keep your credentials secure from SQL injection attacks.
You must be well-adept to this SQL Query interview question. There are four types of collation sensitivity. They are:
Case sensitivity: A and a are treated differently.
Kana sensitivity: Japanese kana characters Katakana and Hiragana are treated differently.
Width sensitivity: Same character represented in single-byte (half-width) and double-byte (full-width) are treated differently.
Accent sensitivity: a and á are treated differently.
If you are performing day to day activities, then you need to find out the data between a particular range. To achieve this, you have to use between..and operator or greater than and less than operator. For instance,
Query 1: Using between..and operator
Select * from employee where salary between 60000 and 80000;
Query 2: Using operators (greater than and less than)
Select * from employee where salary >= 60000 and salary <= 80000.
Data types is a specific storage format that is used to store column values. A few common data types in SQL are:
The discard file stores reflected records based on when clause conditions within the control file. This condition must be satisfied in the table clause. The file extension of the discard file is .dsc. You must specify the discard file within the control file using the discard file clause.
If you are preparing for Oracle SQL interview questions, you must prepare this one thoroughly. Schema is owned by a database user who can manipulate and create new objects within this schema. It is collections of database objects and contains DB objects, such as tables, clusters, indexes, view, stored procs, functions, and more.
This is one of the most asked SQL Query interview questions for experienced professionals. You should know when two or more tables are joined without equal to (=) condition, then that join is referred to as non equi join. You can use any operator, such as <>, !=, <, >, between. For example, Select b.Department_ID,b.Department_name from Employee a,Department b where a.Department_id <> b.Department_ID.
All of the MyISAM tables are stored on disk in three files.
1. The “.frm” file stores the table definition.
2. The data file has a ‘.MYD’ (MYData) extension.
3. The index file has a ‘.MYI’ (MYIndex) extension.
Practice some more SQL Query Interview Questions here.
Being an experienced SQL developer, you must be able to create databases with efficient structures, write optimized queries, triggers, and views for integration with other applications, and understand issues related to network security and performance. Here are a few key practice questions for experienced developers that you must prepare to enhance your tech interview prep.
Recommended Reading: 50+ SQL Interview Questions and Tips on How to Crack Them
If you have an upcoming tech interview in any FAANG company for the position of an experienced developer in SQL, then you must practice these interview questions on SQL Queries for 3 years experienced to create a strong impact on the interviewers.
An Oracle SQL Developer must have a deep understanding of AJAX, AWS, Agile, DHTML, ETL, Ext JS, Git, HTML5, data structures, and data warehouse. In addition to this, you must practice these Oracle SQL Query interview questions for experienced professionals questions mentioned below.
Q1. How to prepare for the SQL Query interview questions for experienced professionals?
If you are an experienced professional with lots of experience, you can crack any tech interview with basic knowledge of SQL. It will help if you practice the SQL Query interview questions for experienced professionals mentioned above and prepare them thoroughly to ace your upcoming interview. You can watch video tutorials, practice speaking the answers before your known ones, or register for free webinars to build confidence in answering the questions.
Q2. What are the five basic SQL commands?
Though this question is the basic one, interviewers check your fundamental knowledge in SQL no matter how experienced you are. So, you must know that there are five basic SQL commands - Data Definition Language (DDL), Data Manipulation Language (DML), Data Control Language (DCL), Transaction Control Language (TCL), and Data Query Language (DQL).
Q3. What are the skills required to crack an SQL interview?
You can create a strong impression on the interviewer if you know how to structure a database, manage it, author SQL statements and clauses, have a profound knowledge of popular database systems, such as MySQL, know how to analyze SQL data, have work knowledge of PHP, and can create a database with SQL and WAMP. SQL is a vast topic to cover; however, polishing these skills will help you crack your next tech interview in any top company.
Q4. What is the average salary of an SQL Developer?
The average salary for a SQL developer is $96,398 per year in the United States and a $5,000 cash bonus per year (Indeed.com). The salary varies according to the job location and years of experience. For instance, an SQL developer in New York gets $111,554 per year, which will get $99,450 per year in Austin.
Q5. How to become an Oracle PL/SQL developer?
To become an Oracle PL/SQL developer, you must have a bachelor’s degree in computer science, information technology, or any other related field from an accredited university. You must have an in-depth understanding of SQL and Oracle extensions and must be able to develop your database. If you have experience, you can stand out and gain an advanced position as a developer in Oracle. Moreover, if you have certifications in Oracle Database PL/SQL Developer Certified Professional or a Microsoft certification in SQL, you can get an edge over your competitors in the recruitment.
Preparing for technical interviews, especially the challenging ones, steers you on the path to becoming a better software professional with improved coding, problem-solving, and behavioral skills. You become more confident at taking and cracking interviews.
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