Basic SQL Quiz By - M Khan
Basic SQL Quiz By - M Khan assesses understanding of SQL syntax and operations. It covers topics like sorting, aliasing, query syntax, precedence rules, and wildcard usage, essential for database management skills.
- 1.
Sorts are Alphabetical in SQL, not Logical.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
In SQL, when sorting data, the default behavior is to sort alphabetically rather than logically. This means that if we have a list of values, SQL will sort them based on their alphabetical order rather than considering their logical order or any specific criteria. For example, if we have a list of numbers, SQL will sort them as if they were strings, resulting in an alphabetical order rather than a numerical order. Therefore, the statement "Sorts are Alphabetical in SQL, not Logical" is true.Rate this question:
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- 2.
Which one is wrong Alias syntax ?
- A.
First_name AS Fname
- B.
Last_name Lname
- C.
Class_Code "Class Code"
- D.
Grade_pt AS AVG
Correct Answer
D. Grade_pt AS AVGExplanation
The given syntax "Grade_pt AS AVG" is incorrect because it does not follow the correct alias syntax. In alias syntax, the keyword "AS" is used to assign an alias to a column or expression. The correct syntax would be "Grade_pt AS AVG" where "Grade_pt" is the column or expression being aliased and "AVG" is the alias assigned to it.Rate this question:
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- 3.
SELECT * FROM Student_table WHERE Grade_pt = 3.0 OR 4.0; What will be the result ?
- A.
Display students from Grade_pt 3.0 or 4.0
- B.
Will show syntax error
- C.
Display only students from Grade_pt 3.0
- D.
Not Sure
Correct Answer
B. Will show syntax errorExplanation
The given SQL query is correct and will not show a syntax error. It will display all the rows from the Student_table where the Grade_pt is either 3.0 or 4.0.Rate this question:
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- 4.
What is the order of Precedence in SQL ?
- A.
( ) NOT OR AND
- B.
AND OR NOT ( )
- C.
NOT OR ( ) AND
- D.
( ) NOT AND OR
Correct Answer
D. ( ) NOT AND ORExplanation
The order of precedence in SQL is determined by the use of parentheses, followed by the NOT operator, and then the AND and OR operators. In this case, the correct answer is "( ) NOT AND OR" which means that expressions inside parentheses are evaluated first, followed by the NOT operator, and then the AND and OR operators. This order ensures that the logical operations are performed in the correct sequence, allowing for accurate query results.Rate this question:
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- 5.
LIKE Keyword uses which two special character ?
- A.
# and @
- B.
$ and %
- C.
% and &
- D.
% and _ (underscore)
Correct Answer
D. % and _ (underscore)Explanation
The LIKE keyword in SQL is used to search for a specified pattern in a column. It supports the use of two special characters: '%' and '_' (underscore). The '%' character is used to represent any sequence of characters, while the '_' character is used to represent a single character. Therefore, the correct answer is % and _ (underscore).Rate this question:
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Current Version
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Mar 21, 2023Quiz Edited by
ProProfs Editorial Team -
May 06, 2014Quiz Created by
Teradatakhan
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