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 Garn
 er','$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'),(&
 #39;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 W
 arren','$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]) VALUES(45,'2021-07-01T06:22:54','8.81'),(80,'2021-07-21T11:03:20','3.32'),(74,'2019-10-08T14:10:56','7.83'),(14,'2021-01-24T00:16:09','6.71'),(30,'2020-09-03T02:11:47','7.24'),(91,'2021-05-11T09:41:06','3.43'),(7,'2019-11-14T19:18:26','3.30'),(57,'2021-05-31T11:08:28','4.01'),(55,'2021-02-01T07:25:24','5.17'),(2,'2020-01-18T04:54:51','6.13'),(44,'2020-03-18T15:59:38','5.90'),(57,'2020-08-16T16:19:47','1.58'),(24,'2021-01-03T21:08:25','1.06'),(61,'2021-06-27T11:06:49','0.65'),(53,'2021-07-01T22:02:22','1.11'),(26,'2021-04-16T14:48:30','6.38'),(10,'2021-03-01T00:48:40','9.79'),(38,'2020-07-03T23:34:40','4.68'),(32,'2019-11-26T10:07:22','8.37&
 #39;),(55,'2020-09-26T07:47:47','3.95'),(41,'2019-09-22T19:05:23','6.85'),(51,'2021-02-06T07:57:37','3.54'),(53,'2020-09-27T02:10:38','5.61'),(62,'2020-03-04T16:11:09','9.55'),(51,'2019-10-15T17:34:05','8.61'),(87,'2020-07-05T23:57:15','3.38'),(95,'2021-03-10T07:48:49','0.89'),(5,'2020-11-09T20:04:14','2.68'),(57,'2021-01-24T08:12:07','5.46'),(13,'2020-07-26T00:57:08','0.26'),(26,'2020-07-27T22:48:32','7.45'),(16,'2019-09-25T17:21:35','6.59'),(8,'2021-07-03T13:19:48','5.03'),(5,'2020-01-19T10:07:14','3.59'),(79,'2020-11-20T17:24:16','4.46'),(67,'2021-03-06T20:04:41','1.81'),(9,'2020-07-27T11:23:25','6.37'),(93,'2020-05-27T08:28:44','2.24'),(37,'2021-06-26T09:54:00',
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 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