branch (branch_name, branch_city, assets) customer (customer_name, customer_street, cust omer_city) loan (loan_number, branch_naте, атоиnt) borrower (сustoтer name, loan питber) ассоunt (аccouиnt_лumber, branchлaтe, balance ) depositor (custoтer-лame, accounnumber) Figure 5.21 Banking database for Exercise 5.6.
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.
Consider the bank
follows:
create view branch_cust as
select branch_name, customer_name
from depositor, account
where depositor.account_number = account.account_number
Suppose that the view is materialized; that is, the view is computed and stored.
Write triggers to maintain the view, that is, to keep it up-to-date on insertions
to depositor or account. It is not necessary to handle deletions or updates. Note
that, for simplicity, we have not required the elimination of duplicates.
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