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Which of the following statements are TRUE about an SQL query?
P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clause
Q : An SQL query can contain a HAVING clause only if it has a GROUP BY clause
R : All attributes used in the GROUP BY clause must appear in the SELECT clause
S : Not all attributes used in the GROUP BY clause need to appear in the SELECT clause
Q : An SQL query can contain a HAVING clause only if it has a GROUP BY clause
R : All attributes used in the GROUP BY clause must appear in the SELECT clause
S : Not all attributes used in the GROUP BY clause need to appear in the SELECT clause
- a)P and R
- b)P and S
- c)Q and R
- d)Q and S
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Which of the following statements are TRUE about an SQL query?P : An S...
According to standard SQL answer should be C. Refer If we talk about different SQL implementations like MySQL, then option B is also right. But in question they seem to be talking about standard SQL not about implementation. For example below is a P is correct in most of the implementations. HAVING clause can also be used with aggregate function. If we use a HAVING clause without a GROUP BY clause, the HAVING condition applies to all rows that satisfy the search condition. In other words, all rows that satisfy the search condition make up a single group. See this for more details. S is correct . To verify S, try following queries in SQL.
CREATE TABLE temp
(
id INT,
name VARCHAR(100)
);
INSERT INTO temp VALUES (1, "abc"); INSERT INTO temp VALUES (2, "abc"); INSERT INTO temp VALUES (3, "bcd"); INSERT INTO temp VALUES (4, "cde");
(
id INT,
name VARCHAR(100)
);
INSERT INTO temp VALUES (1, "abc"); INSERT INTO temp VALUES (2, "abc"); INSERT INTO temp VALUES (3, "bcd"); INSERT INTO temp VALUES (4, "cde");
SELECT Count(*)
FROM temp
GROUP BY name;
FROM temp
GROUP BY name;
Output:
count(*)
--------
2
1
1
--------
2
1
1
Most Upvoted Answer
Which of the following statements are TRUE about an SQL query?P : An S...
Statement P: An SQL query can contain a HAVING clause even if it does not have a GROUP BY clause
This statement is FALSE. The HAVING clause is used to filter the results of a GROUP BY query based on a condition. However, in order to use the HAVING clause, a GROUP BY clause is required. The GROUP BY clause is used to group the rows based on one or more columns, and then the HAVING clause can be used to filter the groups based on a condition.
Statement Q: An SQL query can contain a HAVING clause only if it has a GROUP BY clause
This statement is TRUE. As mentioned earlier, the HAVING clause is used in conjunction with the GROUP BY clause. It allows filtering of the grouped data based on a condition. Therefore, in order to use the HAVING clause, a GROUP BY clause must be present in the SQL query.
Statement R: All attributes used in the GROUP BY clause must appear in the SELECT clause
This statement is TRUE. When using the GROUP BY clause, all the attributes that are used for grouping must also appear in the SELECT clause. This ensures that the query returns the correct results by including the grouped attributes in the output. If an attribute used in the GROUP BY clause is not included in the SELECT clause, it will result in an error.
Statement S: Not all attributes used in the GROUP BY clause need to appear in the SELECT clause
This statement is FALSE. As mentioned in the previous statement, all attributes used in the GROUP BY clause must appear in the SELECT clause. This is to ensure that the grouped attributes are included in the output. If an attribute used in the GROUP BY clause is not included in the SELECT clause, it will result in an error.
Therefore, the correct statements are:
- P and R
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Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer?
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Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer?.
Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? for Computer Science Engineering (CSE) 2024 is part of Computer Science Engineering (CSE) preparation. The Question and answers have been prepared according to the Computer Science Engineering (CSE) exam syllabus. Information about Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Computer Science Engineering (CSE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer?.
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Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer?, a detailed solution for Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? has been provided alongside types of Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? theory, EduRev gives you an
ample number of questions to practice Which of the following statements are TRUE about an SQL query?P : An SQL query can contain a HAVING clause even if it does not have a GROUP BY clauseQ : An SQL query can contain a HAVING clause only if it has a GROUP BY clauseR : All attributes used in the GROUP BY clause must appear in the SELECT clauseS : Not all attributes used in the GROUP BY clause need to appear in the SELECT clausea)P and Rb)P and Sc)Q and Rd)Q and SCorrect answer is option 'C'. Can you explain this answer? tests, examples and also practice Computer Science Engineering (CSE) tests.
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