A retailer maintains a database with four tables: Customers,…

A retailer maintains a database with four tables: Customers, DealershipInfo, SaleTransactions, and ProductList. The Entity Relationship Model (ERM) below illustrates the primary and foreign key relationships among the four database tables. Each table is accompanied by a detailed schema that lists attribute names along with their corresponding data types. In the diagram, a gold key icon identifies the primary key of a table, while a silver key icon marks a foreign key, representing referential connections to related entities. Suppose a product (product_id=5) was discontinued:  Complete the query below to enable deletion of all records associated with that product ID across the entire database (let’s assume the existing foreign key constraint has been removed):  ALTER TABLE salestransactions ADD CONSTRAINT fk_product_trnFOREIGN KEY (product_id) REFERENCES __(1)__ ( product_id ) ___(2)____;  

Suppose a researcher interested in measuring body posture in…

Suppose a researcher interested in measuring body posture instructs participants to maintain existing body posture for the week prior to baseline testing and intervention. Further suppose that the researcher observes the participants during this period of time.  Concerns related to research participants subconsciously demonstrating better posture during observation would link most closely to which of the following?