CUSTOMER (CID, NAME, STREET, CITY, STATE, AGE) SALE (PID, CID, DATE, COST) PART (PID, PNAME, COLOR) The meaning of these relations is straightforward; for example, SALE has one tuple for every part sold to a customer. Primary key attributes are underlined. For instance, PID and CID together form the primary key of relation SALE. SALE.PID is a foreign key that refers to PART.PID, while SALE.CID is a foreign key that refers to CUSTOMER.CID. Write SQL statements for the following retrieval and update operations. Retrieve the names of all the customers from the city of "Trenton' who bought a part at a cost less than $50. No duplicates should appear in the answer. Retrieve the names of red parts bought by a customer who is younger than 40 and from a customer who is older than 40. Delete all parts that are never bought by a customer from "Trenton" (this is a data change statement). Retrieve the names of the customers who never bought a green part. Retrieve the names of the customers who bought every red part.
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.
COM.
Q. CUSTOMER (CID, NAME, STREET, CITY, STATE, AGE) SALE (PID, CID, DATE, COST) PART (PID, PNAME, COLOR)
The meaning of these relations is straightforward; for example, SALE has one tuple for every part sold to a customer. Primary key attributes are underlined. For instance, PID and CID together form the primary key of relation SALE. SALE.PID is a foreign key that refers to PART.PID, while SALE.CID is a foreign key that refers to CUSTOMER.CID.
Write SQL statements for the following retrieval and update operations.
Retrieve the names of all the customers from the city of "Trenton' who bought a part at a cost less than $50. No duplicates should appear in the answer.
Retrieve the names of red parts bought by a customer who is younger than 40 and from a customer who is older than 40.
Delete all parts that are never bought by a customer from "Trenton" (this is a data change statement).
Retrieve the names of the customers who never bought a green part.
Retrieve the names of the customers who bought every red part.
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