13.What is Correlated Subquery or synchronized Query? Answer: Correlated Query is nothing but the subquery whose output is depending on the inner query used in that query.Correlated query is the query which is executed after the outer query is executed.The outer query is always dependent on inn...
the SQL Server Query Optimizer will search in the plan cache storage for an existing Execution Plan for the submitted query and use it. If there is no plan that can be used for that query, the Query Optimizer
Some of the tools/ways that help you troubleshooting performance problems are: SET SHOWPLAN_ALL ON, SET SHOWPLAN_TEXT ON, SET STATISTICS IO ON, SQL Server Profiler, Windows NT /2000 Performance monitor, Graphical execution plan in Query Analyzer. Download the white paper on performance tuning SQL...
6. Can you write a query to find nth highest salary of an employee? 7. Write a query to delete duplicate records from a table. Note: Write queries that suits the below situation. A table is having a unique key and having duplicates records, table is not having a unique and having...
If you seek more, here are thetop 30 SQL Query Interview Questions, which will help those who want to also prepare for an interview when learning. Thanks for reading! Nate Rosidiis a data scientist and in product strategy. He's also an adjunct professor teaching analytics, and is the foun...
big query here ) SELECT * FROM YourTable1 WHERE ID IN (SELECT ID FROM YourBigCTE) UNION SELECT * FROM YourTable2 WHERE ID IN (SELECT ID FROM YourBigCTE) Scope is next immediate select command. Can be used multiple times within the same CTE command, even recursively, and will last for...
It is also used for performance tuning and troubleshooting.Within the Query Analyzer, there is an option called "Show Execution Plan" in the Query drop-down menu, if this option is turned on, it will display query execution plan in a separate window when the query is ran again.Day10) (...
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 scientist in 2024 in the United States is $123,039. 2. Business analysts or business intelligence ...
5.What is the Query to fetch last record from the table? Answer: Select * from Employee where Rowid= select max(Rowid) from Employee; Complex SQL Queries Click here to get 20 interview questions on Perforance Tuning.. 6.What is Query to display first 5 Records from Employee table?(90%...
Q11: You are working as a database administrator in an international company. If a query that used to take a few seconds has been running for more than 30 minutes. What is the fastest method that can you use to check if that query is blocked by another session?