Answered

Complete the following DML statements related to Javier's database.

(i) Complete the following DML statement to return the number of cars for sale in each shop.

```sql
SELECT COUNT(*)
FROM Cars
GROUP BY ShopID;
```

(ii) Complete the DML statement to include the following car in the table CAR.

```sql
INSERT INTO CAR (RegistrationNumber, Make)
VALUES ('123 AA', 'Tiger');
```

\begin{tabular}{|l|l|}
\hline
\multicolumn{1}{|c|}{Field} & \multicolumn{1}{|c|}{Data} \\
\hline
RegistrationNumber & 123 AA \\
\hline
Make & Tiger \\
\hline
\end{tabular}



Answer :

GinnyAnswer
Let's address each part of the question in detail:

(i) Completing the DML statement to return the number of cars for sale in each shop:

The goal is to count the number of cars available for sale in each shop and group the results by the `ShopID`.

The syntax for an SQL query to achieve this is as follows:
```sql
SELECT COUNT() AS NumberOfCars, ShopID
FROM Cars
GROUP BY ShopID;
```

Explanation:
1. `SELECT COUNT() AS NumberOfCars, ShopID`: This part of the query selects two things:
- `COUNT() AS NumberOfCars` counts all rows in the `Cars` table for each group of `ShopID` and assigns an alias `NumberOfCars` for readability.
- `ShopID` specifies that we are interested in the unique identifiers for each shop.

2. `FROM Cars`: This specifies the table from which to retrieve the data, in this case, the `Cars` table.

3. `GROUP BY ShopID`: This groups the results based on each unique `ShopID`. The counting of cars will be done within these groups.

(ii) Completing the DML statement to include a specific car in the table CAR:

Here, we need to insert a new record into the `CAR` table with the given registration number and make.

The correct SQL statement to achieve this is:
```sql
INSERT INTO CAR (RegistrationNumber, Make)
VALUES ('123 AA', 'Tiger');
```

Explanation:
1. `INSERT INTO CAR (RegistrationNumber, Make)`: This part indicates that we are inserting data into the `CAR` table and specifies the columns which will be receiving new data, namely `RegistrationNumber` and `Make`.

2. `VALUES ('123 AA', 'Tiger')`: This part provides the actual data values to be inserted into the specified columns. Here, '123 AA' is for the `RegistrationNumber` column, and 'Tiger' is for the `Make` column.

In conclusion, the complete solutions to the tasks are:

(i) Return the number of cars for sale in each shop:
```sql
SELECT COUNT() AS NumberOfCars, ShopID
FROM Cars
GROUP BY ShopID;
```

(ii) Include the specified car in the `CAR` table:
```sql
INSERT INTO CAR (RegistrationNumber, Make)
VALUES ('123 AA', 'Tiger');
```

These SQL statements address Javier's requirements for Data Definition Language (DDL) and Data Manipulation Language (DML) operations in his database.

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