create database GA2 go use GA2 go create table salesman( salesman_id int primary key, name varchar(30), city varchar(20), commission varchar(30) ); insert into salesman (salesman_id, name, city, commission) values (5001, 'James Hoog', 'New York', 0.15); insert into salesman (salesman_id, name, city, commission) values (5002, 'Nail Knite', 'Paris', 0.13); insert into salesman (salesman_id, name, city, commission) values (5005, 'Pit Alex', 'London', 0.11); insert into salesman (salesman_id, name, city, commission) values (5006, 'Mc Lyon', 'Paris', 0.14); insert into salesman (salesman_id, name, city, commission) values (5007, 'Paul Adam', 'Rome', 0.13); insert into salesman (salesman_id, name, city, commission) values (5003, 'Lauson Hen', 'San Jose', 0.12); Create table Customer ( customer_id int primary key, cust_name varchar(30), city varchar(10), grade varchar(30), salesman_id int, CONSTRAINT FK_salesman_id FOREIGN KEY (salesman_id) REFERENCES salesman(salesman_id) ); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3002, 'Nick Rimando', 'New York', 100, 5001); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3007, 'Brad Davis', 'New York', 200, 5001); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3005, 'Graham Zusi', 'California' , 200, 5002); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3008, 'Julian Green', 'London', 300, 5002); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3004, 'Fabian Johnson', 'Paris', 300, 5006); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3009, 'Geoff Cameron', 'Berlin', 100, 5003); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3003, 'Jozy Altidor', 'Moscow', 200, 5007); insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3001, 'Brad Guzan', 'London',0, 5005); SELECT s.name, c.cust_name, c.city FROM salesman s INNER JOIN customer c ON s.city = c.city; select sum(commission) as total_commission from salesman; i keep getting this message Msg 8117, Level 16, State 1, Line 55 Operand data type varchar is invalid for sum operator. can you show me what to do
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
go
use GA2
go
create table salesman(
salesman_id int primary key,
name varchar(30),
city varchar(20),
commission varchar(30)
);
insert into salesman (salesman_id, name, city, commission) values (5001, 'James Hoog', 'New York', 0.15);
insert into salesman (salesman_id, name, city, commission) values (5002, 'Nail Knite', 'Paris', 0.13);
insert into salesman (salesman_id, name, city, commission) values (5005, 'Pit Alex', 'London', 0.11);
insert into salesman (salesman_id, name, city, commission) values (5006, 'Mc Lyon', 'Paris', 0.14);
insert into salesman (salesman_id, name, city, commission) values (5007, 'Paul Adam', 'Rome', 0.13);
insert into salesman (salesman_id, name, city, commission) values (5003, 'Lauson Hen', 'San Jose', 0.12);
Create table Customer (
customer_id int primary key,
cust_name varchar(30),
city varchar(10),
grade varchar(30),
salesman_id int,
CONSTRAINT FK_salesman_id FOREIGN KEY (salesman_id) REFERENCES salesman(salesman_id)
);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3002, 'Nick Rimando', 'New York', 100, 5001);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3007, 'Brad Davis', 'New York', 200, 5001);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3005, 'Graham Zusi', 'California' , 200, 5002);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3008, 'Julian Green', 'London', 300, 5002);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3004, 'Fabian Johnson', 'Paris', 300, 5006);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3009, 'Geoff Cameron', 'Berlin', 100, 5003);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3003, 'Jozy Altidor', 'Moscow', 200, 5007);
insert into customer (customer_id, cust_name, city, grade, salesman_id) values (3001, 'Brad Guzan', 'London',0, 5005);
SELECT s.name,
c.cust_name,
c.city
FROM salesman s
INNER JOIN customer c
ON s.city = c.city;
select sum(commission) as total_commission from salesman;
i keep getting this message
Msg 8117, Level 16, State 1, Line 55
Operand data type varchar is invalid for sum operator.
can you show me what to do
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