Query To Return Sale Amount For Specified Employee

Question

Below is my DDL - How can (in one query) I input an employee name and from the given employee name display all stores that were worked at and Total sale amounts per store for the specified employee?  Sample output would be
Store Name   Employee Name  Sale Amt
Two     afaslkfasd
100
Five      aslkjfla          300
Create Table StoreInfo
storeid int IDENTITY(1,1) PRIMARY KEY,
storename varchar(100),
employeeid int,
employee varchar(100)
Create Table SaleInfo
saleid int IDENTITY(1,1) PRIMARY KEY,
storeid int,
employeeid int not null,
saleamount int,
dateofsale SMALLDATETIME null
INSERT INTO StoreInfo VALUES
('One', 1, 'Mike Jones'),
('Two', 2, 'Lee Jones'),
('Three', 3, 'Fred Marx'),
('Four', 4, 'Lillard Halfling'),
('Five', 5, 'Joey Fratada'),
('Six', 6, 'Lethan James'),
('Seven', 7, 'Four-Finger Charlie'),
('Eight', 8, 'Twice Sold'),
('Nine', 9, 'Richard Jackson'),
('Ten', 10, 'Fred Mitch')
INSERT INTO SaleInfo VALUES
(1,1,452, '12-21-14'),
(1,1,452, '9-7-14' ),
(1,2,500, '12-7-14' ),
(1,3,100, '3-12-14' ),
(1,6,275, '12-2-14' ),
(1,7,800, '1-12-14' ),
(2,4,200, '2-16-14' ),
(2,5,110, '12-7-14' ),
(2,1,120, '8-12-14' ),
(2,3,320, '2-22-14' ),
(3,3,50, '3-12-14' ),
(3,1,75, '8-2-14' ),
(3,8,20, '7-12-14' ),
(3,9,42, '12-8-14' ),
(4,10,52, '12-16-14' ),
(4,1,152, '12-4-14'),
(4,8,452, '5-1-14'),
(4,7,752, '2-28-13' ),
(4,6,52, '1-22-14' ),
(4,2,42, '12-28-13' )

Answer 1

Thank you for trying to post the DDL we need to answer this. But you do not know RDBMS, or industry and ANSI/ISO standards in your data. You should learn ISO-11179 rules for naming data elements. You should follow ISO-8601 rules for displaying temporal
data. Your choice of proprietary date format is literally the worst way to do it! Why do you think that IDENTITY has any place in RDBMS? Where were you when they discussed keys? You also have no idea what a normalized table is. An employee has a relationship
with a store; he is not an attribute of one! When you fire an employee, you destroy a store in your schema. 
Do people in your world have hundred letter names? The Post office uses 35 for an address line. If you invite garbage data, it will come. 
Why do you think that “_info” is a valid table name? Why are prices expressed in integers and not decimals? What currency on Earth is not decimal?
You need to read and download the PDF for: 
https://www.simple-talk.com/books/sql-books/119-sql-code-smells/
Below is my DDL - How can (in one query) I input an employee name and from the given employee name display all stores that were worked at and Total sale amounts per store for the specified employee? 
Why don't you use DRI? That is what RDBMS is all about. 
CREATE TABLE Stores
(store_nbr CHAR(3) NOT NULL PRIMARY KEY
 CHECK (store_nbr LIKE '[0-9][0-9][0-9]'), 
 store_name VARCHAR(35) NOT NULL);
CREATE TABLE Personnel
(employee_id CHAR(10) NOT NULL PRIMARY KEY, 
 employee_name VARCHAR(35)NOT NULL);
Since we have no business rules, I will assume each employee is at one and one store, but a store can have many employees. 
CREATE TABLE Job_Assignments
(store_nbr CHAR(3) NOT NULL 
 REFERENCES Stores(store_nbr)
 employee_id CHAR(10) NOT NULL PRIMARY KEY
 REFERENCES Personnel (employee_id));
The sales tickets can be a CREATE SEQUENCE but let's skip that for now. I swill not re-copy your data into this valid schema, but you might want to do it to learn how. 
CREATE TABLE Sales
(sale_ticket INTEGER NOT NULL PRIMARY KEY,
 store_nbr CHAR(3) NOT NULL 
   REFERENCES Stores(store_nbr)
 employee_id CHAR(10) NOT NULL
   REFERENCES Personnel (employee_id), 
 sale_amount DECIMAL(12,2) NOT NULL, 
 sale_date DATE DEFAULT CURRENT_TIMESTAMP NOT NULL);
>> How can (in one query) I input an employee name and from the given employee name display all stores that were worked at and Total sale amounts per store for the specified employee?  <<
SELECT employee_name, store_name,
       SUM(T.sale_amount) AS sales_amt_tot
  FROM Sales AS T, Personnel AS P, Stores AS S
 WHERE P.employee_name = @in_employee_name
   AND T.employee_id = S.Employee_id 
   AND T.store_id = S.store_id 
 GROUP BY employee_name, store_name;
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