Здравствуйте, Анна!
Вот скрипт для тестирования с решением:
[code lang=sql]CREATE DATABASE Test
GO

USE Test
GO

CREATE TABLE client
(
[id] int IDENTITY(1,1),
[name] nvarchar(30) NOT NULL,
[rate] money NOT NULL
);
GO

CREATE TABLE calls
(
[id] int,
[time] datetime NOT NULL,
[duration] float NOT NULL
);
GO

INSERT INTO client([name],[rate]) VALUES('Kibo Wilkins','$2.43'),('Tiger Burks','$2.67'),('Howard Brown','$1.71'),('Kuame Ray','$2.02'),('Macon Webb','$2.74'),('Alan Carter','$2.27'),('Fritz Winters','$2.44'),('Ivor Hess','$3.13'),('Fitzgerald Pittman','$3.08'),('Cameron Larson','$3.39'),('Cedric Slater','$2.92'),('Kermit Simpson','$3.38'),('Grady Cotton','$1.52'),('Kasimir Hays','$2.33'),('Shad Weaver','$3.30'),('Akeem Lyons','$2.57'),('Igor Davis','$3.26'),('Michael Frost','$1.97'),('Oren Dominguez','$2.90'),('Chancellor Stone','$2.20'),('Nissim Barnes','$3.31'),('Harrison Miles','$2.34'),('Gabriel Fulton','$2.97'),('Wyatt Delaney','$3.49'),('Hamilton Mooney','$2.42'),('Vance Wilson','$3.28'),('Julian Clarke','$2.68'),('Seth Talley','$3.42'),('Evan Turner','$1.98'),('Vaughan Wilson','$3.09'),('Sawyer Aguilar','$2.09'),('Stephen Pruitt','$2.46'),('Brandon Peters','$3.47'),('Sylvester Hurley','$3.00'),('Axel Mcdonald','$2.75'),('Kirk Richardson','$2.52'),('Keith Rich','$1.50'),('Benedict Goodwin','$2.45'),('Forrest Holcomb','$2.01'),('Tanek Trujillo','$1.76'),('Alan Humphrey','$2.81'),('Palmer Shaw','$1.51'),('Armando Ingram','$2.72'),('Nathan Wilder','$2.14'),('Isaiah Stuart','$1.62'),('Louis Vang','$2.83'),('Cole Garner','$3.25'),('Theodore Whitney','$1.57'),('Wallace Cox','$3.15'),('Benedict Wallace','$1.76'),('Cairo Wells','$2.62'),('Kuame Knowles','$3.20'),('Luke Pace','$2.69'),('Walker Wells','$1.81'),('Oren Cantrell','$1.56'),('Jin Robles','$1.52'),('Wing Hampton','$3.32'),('Timothy Daniel','$3.46'),('Austin Gomez','$2.93'),('Seth Wheeler','$1.83'),('Flynn Compton','$3.17'),('Barry Hebert','$3.40'),('Raymond Mcdaniel','$1.95'),('Tanner Valdez','$2.26'),('Berk Gibson','$2.04'),('Timothy Salazar','$2.39'),('Caesar Farrell','$2.52'),('Kareem Harris','$2.97'),('Jeremy Nicholson','$2.90'),('Dennis Wise','$2.78'),('Eagan Walters','$1.91'),('Tobias Maldonado','$1.58'),('Griffin Strong','$3.26'),('Caldwell Aguilar','$3.13'),('Drew Goff','$3.06'),('Joshua Ewing','$2.27'),('Hunter Mendoza','$3.13'),('Kenneth Thomas','$1.65'),('Hiram Weber','$2.39'),('Lester Barrera','$2.56'),('Jarrod Myers','$1.74'),('Sebastian Noel','$1.52'),('Armand Kinney','$2.54'),('Nathaniel Greene','$1.90'),('Brett Carter','$1.87'),('Logan Gates','$1.77'),('Ethan Singleton','$2.52'),('Edan Morton','$3.26'),('Josiah Cleveland','$3.01'),('Perry Christensen','$1.59'),('Ashton Estrada','$2.65'),('Brandon Calderon','$2.36'),('Leo Weber','$3.37'),('Kennedy Warren','$2.34'),('Brennan Shaw','$3.34'),('Fletcher Craft','$1.74'),('Ali Pugh','$3.43'),('Hakeem Daniel','$1.71'),('Gage Hampton','$2.36'),('Griffith Ruiz','$1.73');

INSERT INTO calls([id],[time],[duration]) 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1:32:28','2.73'),(90,'2020-09-09T04:03:24','6.26'),(1,'2020-09-23T23:18:15','2.75'),(42,'2020-09-02T08:55:53','1.29'),(86,'2020-09-15T05:09:27','3.40'),(12,'2020-09-14T17:33:41','9.17'),(38,'2020-09-25T01:05:43','3.07'),(57,'2020-09-13T05:51:00','8.85'),(22,'2020-09-26T10:29:06','2.61'),(71,'2020-09-14T20:12:45','0.31'),(92,'2020-09-02T16:41:56','9.33');
GO

-- Запрос, который будет возвращать стоимость всех разговоров для каждого абонента
SELECT id,
SUM(duration) AS TotalDuration
INTO #Duration
FROM calls
GROUP BY id

SELECT c.name, c.rate * d.TotalDuration AS TotalSum FROM #Duration AS d
JOIN client AS c ON d.id = c.id
ORDER BY c.name
GO

-- Запрос, который возвращает имена абонентов, совершивших только один звонок
/*SELECT cl.id, COUNT(cl.id) AS CountNum, c.name FROM calls cl
JOIN client c ON cl.id = c.id
GROUP BY cl.id, c.name
HAVING COUNT(cl.id) = 1*/

SELECT c.name FROM calls cl
JOIN client c ON cl.id = c.id
GROUP BY cl.id, c.name
HAVING COUNT(cl.id) = 1
GO
[/code]
Возможно, в первом задание нужно выводить id вместо name.