2. How can SQL Server instances be hidden? 3. Can we add a CPU to SQL Server? 4. How can we check whether the port number is connecting or not on a Server DBA? 5. How can you start SQL Server in different modes? 6. Why is SHRINKFILE / SHRINKDB / AUTOSHRINK not preferable? 7...
SQL - Using Single-Row Functions SQL - Conditional Expressions SQL - Using the Group Functions SQL - Get Data from Multiple Tables SQL - Subqueries to Solve Queries SQL - Using the Set Operators SQL - Manipulating Data SQL - Using DDL Statements SQL - Creating Other Schema Objects SQL - The...
We can optimize a slow-moving SQL query by using indexing in the DBMS to find the specific rows in a table very quickly. There are several optimization techniques listed below Using Indexes Using Distinct Clause Using Having and Where clauses Avoiding correlated subqueries Using Limit to restrict...
20) Which are the fundamental types of Joins used in Oracle to write subqueries? For experienced candidates, this is one of the most common Oracle interview questions. Subqueries in the Oracle database are written using the following primary join types: - Self Join - Equi Join - Outer Join ...
There are two parts of a subquery. The two parts involve the outer query and the inner query. The inner query is basically called as a subquery, and the outer query is known as the main query in the Database. The implementation of subqueries is always done first, and the outcome of th...
SQL - Using Single-Row Functions SQL - Conditional Expressions SQL - Using the Group Functions SQL - Get Data from Multiple Tables SQL - Subqueries to Solve Queries SQL - Using the Set Operators SQL - Manipulating Data SQL - Using DDL Statements SQL - Creating Other Schema Objects SQL - The...
SQL interview questions for data engineerscover fundamental concepts like joins, subqueries, case statements, and filters. In addition, if required to write SQL code, it could test if you know how to pull metrics or questions that determine how you handle errors and NULL values. Common SQL ques...
Module 1. SQL Server Q&A: Introduction and Database Basics Lessons (2) Introduction to SQL Server 0:20:00 Database Basics 0:20:00 Module 2. SQL Server Q&A: SQL Queries and Statements Lessons (2) Module 3. SQL Server Q&A: Joins and Subqueries Lessons (2) Module 4. SQL Server...
One example of this is when optimizers will rewrite subqueries into their equivalent joins, and that will make the processing that must follow much simpler. For some DBMS’s, there are certain options that have to be enabled so that the optimizer can actually rewrite queries. ...
Yes. It is absolutely possible to select data from multiple tables using SQL. This can be done in several ways. These include: JOIN tables Use subqueries Use comma separated list of tables 11. What is a JOIN in SQL? What are the types?