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Ques:- Display the records between two range I know the nvl function only allows the same data type(ie. number or char or date Nvl(comm, 0)), if commission is null then the text ?Not Applicable? want to display, instead of blank space. How do I write the query
Ques:- Can we use a having cluase in groupby clause.if there are 500 records i will give rownumber<250 then howmany records does it retrieve.wt is the result of nvl2(null,notnull,null)if there are four tables without using cartesian how manyjoins can be there.in the sql subqueries wt is the parent ans1)select2)update,3) delete 4)2&3
Ques:- Table X havng 3 column A,B,C….A column havng data 10 20 30…..now i wanna have 1o value in A columns all three rows
Asked In :- crest infotech,
Ques:- How to retrieve Duplicate Rows only in a Table? Suppose if a Table Name is “Education”. It consists of multiple columns. Then if we insert rows into this table with duplicate records then how can we retrieve only duplicate records from that table?
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Ques:- Which command displays the SQL command in the SQL buffer, and then executes it
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The MySQL category on takluu.com is tailored for candidates aiming to master the fundamentals and advanced concepts of relational databases. Whether you’re a backend developer, data analyst, DBA, or full-stack engineer, understanding MySQL is essential for working with structured data in real-world applications.

MySQL is one of the most widely used open-source relational database management systems (RDBMS). It is trusted by small startups to large-scale enterprises due to its reliability, scalability, and performance. Interviewers often assess candidates on their ability to write efficient SQL queries, understand relational concepts, normalize data, and manage indexing and performance tuning.

In this section, you’ll find carefully curated interview questions covering a range of topics, including:

  • Basic SQL queries (SELECT, INSERT, UPDATE, DELETE)

  • Joins (INNER, LEFT, RIGHT, FULL)

  • Grouping and aggregate functions (GROUP BY, COUNT, SUM, AVG)

  • Subqueries and nested queries

  • Indexing and performance optimization

  • Transactions, ACID properties, and locks

  • Stored procedures, triggers, and views

  • User management and privileges

This category not only prepares you for syntax-based questions but also for scenario-based problems, such as query optimization, handling large datasets, designing database schemas, and managing concurrency issues.

Our goal is to help you answer MySQL questions with clarity and confidence, demonstrating both your theoretical understanding and practical experience. With real-life examples and mock interview challenges, you’ll be well-prepared to face technical rounds at companies ranging from startups to MNCs.

Use this category as your go-to resource to strengthen your MySQL knowledge, whether you’re preparing for a developer, analyst, or database administrator role.

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