15 Questions
Why does the SQL Editor only show the result of the last query, even if there are multiple queries present?
To improve query performance and avoid displaying irrelevant data.
What is one reason a query might timeout?
Returning a large amount of data from the database.
What is the purpose of limiting the number of rows retrieved from the database?
To speed up query execution by reducing data transfer.
Why is it considered an unnecessary overhead to bring in a lot of data from the database?
It increases network traffic and may lead to slower performance.
How does limiting the number of rows help in avoiding accidental selection of 'Select * From' with a table comprising millions of rows?
By reducing the chance of running resource-intensive queries.
Running multiple queries in the SQL Editor will display all the query results at once.
False
Limiting the number of rows in a query is done to prevent long-running queries in the database.
True
A query might timeout if it retrieves values from the database too quickly.
False
One reason to limit the number of rows retrieved from the database is to avoid accidentally selecting 'Select * From' with a table of millions of rows.
True
Bringing in a lot of data from the database is considered necessary for optimizing query performance.
False
Match the following reasons with the considerations when running queries in SQL:
To prevent long-running queries = Limiting the number of rows retrieved from the database To avoid halting the database = Avoiding accidental selection of 'Select * From' with a table of millions of rows To optimize query performance = Bringing in a lot of data from the database To improve query speed = Retrieving values from the database too quickly
Match the following outcomes with the actions taken when running queries:
Only one query result is displayed = SQL Editor having several queries A query could timeout = Not returning values from the database or web server request timing out Preventing unnecessary overhead = Limiting the number of rows retrieved from the database Avoiding long-running queries = Bringing in a lot of data from the database
Match the following implications with the reasons for limiting the number of rows retrieved from the database:
Preventing accidental selection of 'Select * From' = Avoiding halting the database Avoiding bringing in excessive data = Unnecessary overhead from database Optimizing query performance = Limiting row retrieval to prevent long-running queries Improving query efficiency = Reducing chances of query timeouts
Match the following consequences with the considerations when running queries in SQL:
Halting the database = Selecting 'Select * From' with a table comprising millions of rows Long-running queries = Not limiting the number of rows retrieved from the database Accidental selection of excessive data = 'Select * From' with a large table Query timeouts = Retrieving values too quickly from the database
Match the following actions with their purpose when running queries:
Bringing in a limited amount of data = Preventing accidental selection of 'Select * From' with a large table Limiting row retrieval = Avoiding long-running queries and unnecessary overhead Optimizing query performance = Improving query speed and efficiency Avoiding query timeouts = Retrieving values at an appropriate pace from the database
Explore important considerations when running SQL queries, such as only one query result shown in the SQL Editor, dealing with query timeouts, and limiting the number of rows retrieved from the database to prevent long-running queries.
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