Structured Query Language is the main part of the relational database, which can be utilized for gaining access to the database and also plays a major role in the management of the database. On the other hand, MySQL is a Relational Database Management System like SQL Server, Informix, and...
When we execute a query and use theWHEREkeyword on a column that does not have an index, then the SQL Server has to do a full-table scan and check every row to find matches. This is a bad practice because it can be unpredictable in terms of execution time. Therefore this process may...
Q.Whatiscorrelatedsub-query? ACorrelatedsub_queryisasub_querywhichhasreferencetothemain query. Q. What is an Integrity Constraint ? A Integrity constraint is a rule that restricts values to a column in a table. Q. What is Referential Integrity ?
SQL is Structured Query Language, which is a computer language for storing, manipulating and retrieving data stored in relational database.SQL can be used in different languages or database management systems like Oracle,SQL Server,Postgresql. Click Here to Get Information of Oracle.. 2.What are...
1 What are query types in a database? 1 What is a join in SQL Server? 1 What are different types of joins in SQL Server? 1 What is Self-Join? 1 What is Cross-Join? 1 What is user defined functions? 1 What are all types of user defined functions? 1 What is collation...
You need to be able to write complex SQL queries to get exactly the data you need for your study. This could mean using joins, writing subqueries, using SQL window functions, and similar techniques while observing query performance tuning. According to Indeed, the average salary for a data ...
SQL Server SQL Server Integration Services Index : "Invalid object name '#Temp'.". Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly. '1899-12-30 00:00:00.000' appears in Date...
Bonus Section: Use SQL Query Optimization Tools Due to the complexity of long codes and highly complex queries, you might consider using query optimization tools. These tools can analyze your query execution plans, identify missing indexes, and suggest alternative query structures to help optimize you...
Intermediate SQL interview questions with detailed answers: 11. Find Customer Order Counts Question: Write a query to list customers who have placed more than 5 orders. Use the customers and orders tables. Answer: SELECT c.customer_id, c.customer_name, COUNT(o.order_id) AS order_count ...
If you are not very familiar with the Query Store feature, please check my series of blog posts on Query Store here. In this post, you are going to learn about the advancements of the Query Store released in SQL Server 2022. This is the first blog post for this series. You can ...