Problem 7 Write a query to produce the total number of hours and charges for each of the projects represented in the ASSIGNMENT table, sorted by project number. The output is shown in Figure P7.7. PROJ NUM 15 18 22 25 SumOfASSIGN HOURS 20.5 23.7 27.0 19.4 Figure P7.7 Task SumOfASSIGN_CHARGE 1806.52 1544.80 2593.16 1668.16
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.
Below is the answer I got but it is incorrect
select PROJ_NUM, ROUND(SUM(ASSIGN_HOURS),2) as 'TOTAL_HOURS', ROUND(SUM(ASSIGN_CHARGE),2) as 'TOTAL_CHARGE'
from ASSIGNMENT -- from ASSIGNMENT table
group by PROJ_NUM; -- group by to aggregate per PROJ_NUM
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