1)Use querv tree to optimize the following query. SELECT order_num, mfr, product, rep, price From orders, products Where price > 100 And Qty-On-hand > 3 and mfr = mfr_id and product = product_id

Q: Rewrite the following query in relational algebra form using operator tree. SELECT std_name FROM…

A: Relational algebra may be a procedural language , which takes instances of relations as input and…

Q: Tollowing query in rélátional algebra form using operator tree. SELECT std_name FROM…

A: Relational algebra is a procedural query language, which takes instances of relations as input and…

Q: Write a SOQL Query to find out the name of account wher the start with the keyword test.

A: Introduction: Salesforce has its own language to query the given object fields and their values.…

Q: Given the table: emp [eid, ename, salary, d_id] The following query retrieve the department name…

A: The table:  emp [eid, ename, salary, d_id] The query: select d_name from dep where d_id = ( select…

Q: Write a query to delete payment details from payments table where discount coupon 'D1' was applied.…

A: Required: We have to write a SQL query to delete payment details from payments table where discount…

Q: 1. Write a query to retrieve student id, name, SERA of students from a student into table. 2. List…

A: Note: Here you asked 6 different questions so I'm going to answer the first three questions.…

Q: by own. Don't try to

A: As per the given problem statement we have to develop a SQL query  to display the name of the…

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: 19. The following code refers to the sample data in the table people. What is the result of each…

A: Note: - As per the guidelines we can only answer one specific question at a time. Please resubmit…

Q: Express each query using Relational Algebra (RA) expression (use sequence of operations and the…

A: Due to the honor code, i can solve only 1 question. Resubmit the remaining questions 1)  Let create…

Q: This is the problem: (from Database Systems Book, 13th ed) Write a query to display the author last…

A: Create table AUTHORS_OF_BOOKS using the below query: SQL QUERY: /* Create a table called NAMES…

Q: Write and execute a SQL query to list all patient numbers and encounter ids which do not have any…

A: Actually, SQL stands for Structured Query Language.

Q: Wite a SQL query to create gientable. ТАBLE-TITLE WORKER REP_ID WORKER TITLE AFFECTED_FROM Manager…

A: Given, Table:

Q: Write a query to display the brand ID, brand name, and average price of products of each brand. Sort…

A: Database management language: The database management system is a collection of inter-related data…

Q: The Driver Relationship team wants to ensure that the all driving license IDs in the active drivers…

A: This is a alter command in mysql to add check in already created table.

Q: Write SOQL Query to find out the Account Id, Name and all the contact and opportunity associated…

A: Use SOQL when you know which objects the data resides in, and you want to: Retrieve data from a…

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

A: - We need to highlight the SQL query for the desired operation of retrieving the department data.