Can an outer join be easily implemented when joining more than two tables? Why or why not?

Q: What type of join is needed when you wish to include rows that do not have matching values?…

A: Refer to step 2 for the answer.

Q: Create a hybrid merge-join version for the situation when both relations are not physically sorted…

A: Introduction: Forgiven relations r and s, merge joins produce natural joins an equijoin.  The Merge…

Q: How is the order in which attributes appear in a result table changed?

A: In Database, each and every table have some attribute and they are listed in the table with some…

Q: When is it not a good idea to establish an index for a table?

A: Please refer to the following step for the complete solution of the problem above.

Q: The Entity Relationship Data Model (Identify the primary key and the foreign key) Represent the…

A: The Entity Relationship Data Model (Identify the primary key and the foreign key) Represent the…

Q: illustrate using students and professor tables what outer join is

A: Let’s consider two tables Students and Professor. Table: Students

Q: it is possible to use a NATURAL join, there are some downsides to using this type of join. What are…

A: Joins: Joins in sql commands which are used to combine rows from two or more tables. based on a…

Q: Parking_Number Car_Model Course Marketing lent_ID 2 Toyota 4 BMW Business IT Оpel Ford Hyundai…

A: Given that using the join statement select records that matching in both tables limited to…

Q: What is a primary key? How important is the primary key in setting a relationship between tables?

A: A Key is a set of attributes that can identify each tuple uniquely of the given relation They used…

Q: Display the CID, CName, RID and RType from both tables using the NATURAL JOIN clause.

A: The SQL NATURAL JOIN is a type of EQUI JOIN and is structured in such a way that, columns with the…

Q: Why aren't the NATURAL JOIN keywords available as a choice for generating a self-join?

A: Introduction : With the help of the NATURAL JOIN keywords, the join is created. Rows from the two…

Q: Explain how the GROUP BY clause works. What is the difference between the WHERE and HAVING clauses?

A: GROUP BY clause: This clause is used to group the number of rows having some similar values. For…

Q: What is equi-join?

A: Equi join is used to fetch the data from both the table on the basis of the value of specified…

Q: How many global descriptor tables can exist?

A: Global Descriptor Table (GDT): GDT is one of two types of tables which contain segment descriptor…

Q: Write a query to find the name of the student(s) who has scored maximum mark in Software…

A: Introduction: As per the given problem statement we are required to develop a SQL code to find the…

Q: Write a query to find the name of the student(s) who has scored maximum mark in Software…

A: As per the given problem statement we are required to develop a SQL code to find the name of the…

Q: Explain the difference between an inner join and an outer join.

A: The join clause is a special keyword in a SQL (Structured Query Language), which is used to combine…

Q: Answer part (4) of question 3.37 but use joins using JOIN ON syntax

A: Lets see the solution.

Q: How many inner joins are possible in the attached scenario? write a query for inner join, left join,…

A: There are 3 inner joins possible. They are: between country and province; here CtrID is the primary…

Q: What are joins and mention different types of joins?

A: Joins in SQL are used to combine two or more tables with common fields between them. there are 4…

Q: How many rows are returned in a Cartesian join between one table having 5 records and a second table…

A: Cartesian Join: In relational databases, the Cartesian Join between two tables refers to as the join…

Q: Create these two tables exactly as in the 1. figure above using SQL Developer or SQL Command Line 2.…

A: CREATE TABLE Branch1( branchNo varchar(255), bCity varchar(255) );   INSERT INTO Branch1 VALUES…

Q: what is joining two tables using an ID

A: INTRODUCTION: Here we need to tell what is joining two tables using an ID.

Q: Produce a resulting table with data after each of the following relational join operations has been…

A: (SELECT * FROM MemberListA) UNION ALL (SELECT * FROM MemberListB);   (SELECT * FROM MemberListB)…

Q: Explain the distinction between an inner and an outer join.

A: The join clause is a special keyword in SQL (Structured Query Language), which is used to combine…

Q: Using the STUDENT and PROFESSOR tables, illustrate the difference between a natural join, an…

A: PRODUCT operator: It is used to find the Cartesian product of two attributes present in the…

Q: What's the difference between a left outer join, right outer join, and a full outer join?

A: Basically Join clause is used to join two or more tables. Left outer join: It returns all the…

Q: What is a natural join?

A: NATURAL JOIN It is a JOIN operation that creates an indirect join clause for you on the basis of…

Q: type of JOIN along with their SQL query

A: Solution. The types of JOIN that we can use in SQL are as under: Inner JOIN, Full/Outer JOIN,…

Q: What is the difference between an outer join and an inner join? Give an example.

A: Given: What is the difference between an outer join and an inner join? Give an example.

Q: Write a query to display the block number and number of departments in each block and give an alias…

A: To display the block number and number of department in each block.

Q: Study the relational schema: CUST(ID, Name, ProdID) PROD(ProdID, PName, Price) Which of the…

A: To specify how we join two tables we use the following format SELECT * FROM [table1] JOIN [table2]…

Q: For the database of Figure 4.12, write a query to find the ID of each employee with no manager. Note…

A: Database: The database contains the collection of information organized in such a way that can be…

Q: When is an outer join used instead of a natural join?

A: Natural join It eliminates the duplicate columns and the join is done in between the values in…

Q: When should you use an exterior join rather than a natural join?

A: Introduction: Natural join It removes duplicate columns and performs the join between the values in…

Q: Discuss if outer joins are implemented easily for more than two tables or not.

A: Given:

Q: One row in the PAT_ENC table represents one patient encounter. One row in the ORDER MED table…

A: Answer: Explanation: For the above problem, the table PAT_ENC contains Patient ID as the primary key…

Q: For the database  Figure, write a query to find the ID of each employee with no manager. Note that…

A: Query using an outer join is as follows, select ID from employee natural left outer join manages…

Q: For the database of Figure 4.12, write a query to find the ID of each employee with no manager. Note…

A: Query for finding the employees with no manager: Consider the “Employee database” given in Figure…

Q: Study the two tables below and answer the questions that follow. Using the relational operator left…

A: Here in this question we have given two table and we have asked to perform left outer join on these…

Q: Write a query that uses NATURAL JOIN TO connect the EMPLOYEE and EMPPROJACT table.   Include the…

A: The above question is solved in step 2 :-

Q: 1. In your own words, describe the data that is returned by the 4 basic types of joins : inner join,…

A: given data is  In your own words, describe the data that is returned by the 4 basic types of joins :…

Q: Using the STUDENT and PROFESSOR tables, illustrate the difference between a natural join, and…

A: Explanation: PRODUCT operator: It is used to find the Cartesian product of two attributes present…

Intermediate SQL Concepts

A query is a request for data or information from one or more database tables. This information could be presented in the form of pictorials, graphs, or complicated findings which helps in easy interpretation. Structured Query Language (SQL) is the most widely used programming language for retrieving and organizing data from relational databases. Collection of tables with rows and columns is referred to as a database. SQL is the language of databases. It makes it easier to extract specific data from databases, which can then be used for analysis.