Using SQL data definition language, write the SQL statements to change each of the following relations according to the suggestions given below. i. customer (customer id, customer name, street, city) Suggestion: Remove customer name and add lname, fname and initial. ii. account (account number, customer id, branch id, balance) Suggestion: Add a foreign key constraints for customer id and branch id, referencing customer and branch tables. iii. branch(branch id, branch name, branch city, assets) Suggestion: Add the not null constraint to branch name and branch city.
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
change each of the following relations according to the suggestions
given below.
i. customer (customer id, customer name, street, city)
Suggestion: Remove customer name and add lname,
fname and initial.
ii. account (account number, customer id, branch id,
balance)
Suggestion: Add a foreign key constraints for customer
id and branch id, referencing customer and branch
tables.
iii. branch(branch id, branch name, branch city, assets)
Suggestion: Add the not null constraint to branch name
and branch city.
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