Write a trigger to put the total sale order amount before tax (unit price * quantity for all items included in an order) in the OrderAmountBeforeTax column of SaleOrder. */
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.
CREATE TABLE Customer
(CustomerID VARCHAR(20) PRIMARY KEY,
CustomerLName VARCHAR(30),
CustomerFName VARCHAR(30),
CustomerStatus VARCHAR(10));
CREATE TABLE SaleOrder
(OrderID INT IDENTITY PRIMARY KEY,
CustomerID VARCHAR(20) REFERENCES Customer(CustomerID),
OrderDate DATE,
OrderAmountBeforeTax INT);
(OrderID INT REFERENCES SaleOrder(OrderID),
ProductID INT,
Quantity INT,
UnitPrice INT,
PRIMARY KEY (OrderID, ProductID));
/* Write a trigger to put the total sale order amount before tax
(unit price * quantity for all items included in an order)
in the OrderAmountBeforeTax column of SaleOrder. */
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