If you've got an SQL interview coming up, you'll almost certainly be asked about JOIN clauses. Make sure you're prepared by practicing these 5 tough questions on JOINs in advance.
18. What is a join and explain different types of joins Joins are used in queries to explain how different tables are related. Joins also let you select data from a table depending upon data from another table. Types of joins: INNER JOINs, OUTER JOINs, CROSS JOINs.OUTER JOINs are further...
TheEXPLAIN PLANstatement helpsanalyze and optimize SQL queriesby displaying theexecution pathchosen by the database engine. Key Insights from EXPLAIN PLAN: Index usage– Determines if queries are leveraging indexes efficiently. Join methods– Identifiesnested loops, hash joins, or merge joinsused in ex...
Query Relation Database using GenAI and Spring AI LLMs are quite good at producing the source code when they are provided enough context information and asked very clear questions. The same is true for generating SQL queries when they are provided the table/column information through DDL statement...
Joins are useful for bringing data together from different tables based on their database relations. First we will see how the join operates between tables. Then we will explore the Order of Execution when both a join and a where condition exist. Finally we will move our exploration to the ...
These kind of real life scenarios we need to face in day to day life. I will explain other joins in next article. Hope you like this article. Kindly comment if you like the article or if any suggestions. CLICK HERE TO GET 20 MOST IMPORTANT COMPLEX SQL QUERIES FOR INTERVIEW ...
5. How to capture a trace from production without any impact on performance? 6. How to capture the long running queries? 7. What is the migration plan to move 300 databases to a new data centre? We can have an hour downtime.
A view is a virtual table based on one or more tables. Why Use views ? To restrict data access • To make complex queries easy • To provide data independence • To present different views of the same data Q. What are the advantages of Views ?
A table stores and retrieves data from persistent storage whenever the user wants. On the other side, the view is only a virtual table based on the result of some SQL queries, meaning that this will disappear after the session ends. ...
Always ensure your joins are used judiciously to maintain the integrity and performance of your database queries. You can refer to our guided paths on the Coding Ninjas. You can check our course to learn more about DSA, DBMS, Competitive Programming, Python, Java, JavaScript, etc. Also, ...