MCQ IN COMPUTER SCIENCE & ENGINEERING

COMPUTER SCIENCE AND ENGINEERING

SQL

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Which of the following query would limit the output to 5 rows?
A
SELECT * FROM DF 5;
B
SELECT * FROM DF LIMIT 5;
C
SELECT * FROM DF 5 LIMIT;
D
SELECT LIMIT(5) * FROM DF ;
Explanation: 

Detailed explanation-1: -1 Answer. ORDER BY id ASC; In the above query, we used subquery with the TOP clause that returns the table with the last 5 records sorted by ID in descending order. Again, we used to order by clause to sort the result-set of the subquery in ascending order by the ID column.

Detailed explanation-2: -If you don’t need to omit any rows, you can use SQL Server’s TOP clause to limit the rows returned. It is placed immediately after SELECT. The TOP keyword is followed by integer indicating the number of rows to return. In our example, we ordered by price and then limited the returned rows to 3.

Detailed explanation-3: -For example: SELECT TOP(5) contact id, last name, first name FROM contacts WHERE last name = ‘Anderson’ ORDER BY contact id; This SQL SELECT TOP example would select the first 5 records from the contacts table where the last name is ‘Anderson’.

Detailed explanation-4: -Here’s the syntax to select top N rows in MySQL. In the above statement, we list the columns column1, column2, … that you want to select in your query. Also, you need to specify LIMIT n after the table name, where n is the number of rows you want to select. The above query will select top n records in your table.

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