Some rows of the table STUDENT are shown below: CODE NAME DEPARTMENT GPA YEAR 291 ALEX PSI 3.1 1992 938 MICHELE PHY 2.3 1992 931 JHON MD 3.3 2001 182 JOE MD 3.4 2002 190 REY PHY 2.0 2001 330 RON PSI 3.9 2001 You want the name all departments that have a department GPA average of 2004 greater than the global GPA average. Which query gives you the desired result? a. SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT); b. SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 AND AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT) GROUP BY DEPARTMENT; c. SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT GPA FROM STUDENT GROUP BY DEPARTMENT); d. SELECT * FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT);
SQL
SQL stands for Structured Query Language, is a form of communication that uses queries structured in a specific format to store, manage & retrieve data from a relational database.
Queries
A query is a type of computer programming language that is used to retrieve data from a database. Databases are useful in a variety of ways. They enable the retrieval of records or parts of records, as well as the performance of various calculations prior to displaying the results. A search query is one type of query that many people perform several times per day. A search query is executed every time you use a search engine to find something. When you press the Enter key, the keywords are sent to the search engine, where they are processed by an algorithm that retrieves related results from the search index. Your query's results are displayed on a search engine results page, or SER.
|
CODE |
NAME |
DEPARTMENT |
GPA |
YEAR |
|
291 |
ALEX |
PSI |
3.1 |
1992 |
|
938 |
MICHELE |
PHY |
2.3 |
1992 |
|
931 |
JHON |
MD |
3.3 |
2001 |
|
182 |
JOE |
MD |
3.4 |
2002 |
|
190 |
REY |
PHY |
2.0 |
2001 |
|
330 |
RON |
PSI |
3.9 |
2001 |
You want the name all departments that have a department GPA average of 2004 greater than the global GPA average. Which query gives you the desired result?
| a. |
SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT); |
|
| b. |
SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 AND AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT) GROUP BY DEPARTMENT; |
|
| c. |
SELECT DEPARTMENT FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT GPA FROM STUDENT GROUP BY DEPARTMENT); |
|
| d. |
SELECT * FROM STUDENT WHERE YEAR = 2004 GROUP BY DEPARTMENT HAVING AVG(GPA) > (SELECT AVG(GPA) FROM STUDENT); |
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