To change the datatype of the column 'starttime' to datetime and make it as Not null in the table 'bookings', you can use the ALTER TABLE statement in SQL. Here is the step by step process:

1. First, you need to make sure that all the existing data in the 'starttime' column can be converted to datetime. If there are any values that can't be converted, you need to update or delete these rows.

2. Once you are sure that all the data can be converted, you can use the ALTER TABLE statement to change the datatype. Here is the SQL command:

```sql
ALTER TABLE bookings MODIFY starttime datetime NOT NULL;
```

This command will change the datatype of the 'starttime' column to datetime and also make it a Not null column.

3. After running this command, you can check the column details of the 'bookings' table to make sure that the changes have been applied correctly. You can do this with the following command:

```sql
DESCRIBE bookings;
```

This command will print the details of all the columns in the 'bookings' table. You should see that the 'starttime' column now has the type 'datetime' and is marked as 'NO' in the 'Null' column, indicating that it can't contain null values.

Question

To change the datatype of the column 'starttime' to datetime and make it as Not null in the table 'bookings', you can use the ALTER TABLE statement in SQL. Here is the step by step process:

1. First, you need to make sure that all the existing data in the 'starttime' column can be converted to datetime. If there are any values that can't be converted, you need to update or delete these rows.

2. Once you are sure that all the data can be converted, you can use the ALTER TABLE statement to change the datatype. Here is the SQL command:

```sql
ALTER TABLE bookings MODIFY starttime datetime NOT NULL;
```

This command will change the datatype of the 'starttime' column to datetime and also make it a Not null column.

3. After running this command, you can check the column details of the 'bookings' table to make sure that the changes have been applied correctly. You can do this with the following command:

```sql
DESCRIBE bookings;
```

This command will print the details of all the columns in the 'bookings' table. You should see that the 'starttime' column now has the type 'datetime' and is marked as 'NO' in the 'Null' column, indicating that it can't contain null values.

Knowee AI · Accepted Answer

To change the datatype of the column 'starttime' to datetime and make it as Not null in the table 'bookings', you can use the ALTER TABLE statement in SQL. Here is the step by step process:

1. First, you need to make sure that all the existing data in the 'starttime' column can be converted to datetime. If there are any values that can't be converted, you need to update or delete these rows.

2. Once you are sure that all the data can be converted, you can use the ALTER TABLE statement to change the datatype. Here is the SQL command:

```sql
ALTER TABLE bookings MODIFY starttime datetime NOT NULL;
```

This command will change the datatype of the 'starttime' column to datetime and also make it a Not null column.

3. After running this command, you can check the column details of the 'bookings' table to make sure that the changes have been applied correctly. You can do this with the following command:

```sql
DESCRIBE bookings;
```

This command will print the details of all the columns in the 'bookings' table. You should see that the 'starttime' column now has the type 'datetime' and is marked as 'NO' in the 'Null' column, indicating that it can't contain null values.

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