Explain the following statement regarding SQL: Any query that can be written using the subquery approach can also be written using the joining approach but not vice versa.

What are the potential issues with over-relying on the COALESCE function in SQL?

INFO 2303 Database Programming Assignment : PL/SQL Practice Note: PL/SQL can be executed in SQL*Plus or SQL Developer or Oracle Live SQL. Write an anonymous PL/SQL block that will delete all patients for doctors that works in the Family Practice Verify that patients have been deleted accordingly. Then do a select * from patients where doc_id = (select doc_id from doctor where area = ‘Family Practice’. You should get no rows.

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how to build a bookstore database with Entities for Tables Book Authors Bookstore Members Sales transaction Inventory

In a sql database give an example of a search problem that will work with an inner join and will not work with an outer join. How would you write the query? Why does the search fail or succeed?

What is the need for transactions in SQL?

Intersection table is needed when you have a relationship 1:1 M:N M:1 1:M

SQL Query Relational Algebra select avg(customer.age) as "avg_age" from AVG(avg_age) (customer) customer; 1. Select customer phone, customer.address, customer.fullname from customer where exists (select * from billing where billing.cid = customer. Customer id); 2. Select * from customer where customer.address in ('Ibri'); 3. Select billing.bill id from billing Group by bill id Having count (case when billing.b status = 'REJWCTED' then 1 end)>1; select * from customer order by full name, age;

Schema: Frequents(kid, store) Sells(store, candy) Likes(kid, candy) d) Use SQL to list the names of all the candies that are liked by at least one kid, along with the names of the stores that sell them. Sort the result in alphabetical order by candy name.