Using SQL data definition language, write the SQL statements to create each of the following relations. i. customer(cust id, lname, fname, initial, area code, phone, balance) ii. product(prod id, vendor id, description, expiry date, quantity, reorder level, price, discount) iii. vendor(vendor id, name, contact, area code, phone, state) iv. invoice(inv number, cust id, date, subtotal, tax, grand total) Note: Use primary key, foreign key and not null constraints where necessary.
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.
Using SQL data definition language, write the SQL statements to
create each of the following relations.
i. customer(cust id, lname, fname, initial, area code, phone,
balance)
ii. product(prod id, vendor id, description, expiry date, quantity,
reorder level, price, discount)
iii. vendor(vendor id, name, contact, area code, phone, state)
iv. invoice(inv number, cust id, date, subtotal, tax, grand total)
Note: Use primary key, foreign key and not null constraints where
necessary.
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