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 ensure that all existing data in the 'starttime' column can be converted to datetime. If there are any values that cannot be converted, you will need to update or delete these rows.

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

```sql
ALTER TABLE bookings
ALTER COLUMN starttime TYPE TIMESTAMP;
```

3. To make the column Not null, you can use the SET NOT NULL command:

```sql
ALTER TABLE bookings
ALTER COLUMN starttime SET NOT NULL;
```

Please note that these commands are for PostgreSQL. The exact syntax might vary depending on the SQL dialect you are using. Also, please make sure to backup your data before making these changes, as they can potentially result in data loss.

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 ensure that all existing data in the 'starttime' column can be converted to datetime. If there are any values that cannot be converted, you will need to update or delete these rows.

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

```sql
ALTER TABLE bookings
ALTER COLUMN starttime TYPE TIMESTAMP;
```

3. To make the column Not null, you can use the SET NOT NULL command:

```sql
ALTER TABLE bookings
ALTER COLUMN starttime SET NOT NULL;
```

Please note that these commands are for PostgreSQL. The exact syntax might vary depending on the SQL dialect you are using. Also, please make sure to backup your data before making these changes, as they can potentially result in data loss.

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 ensure that all existing data in the 'starttime' column can be converted to datetime. If there are any values that cannot be converted, you will need to update or delete these rows.

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

```sql
ALTER TABLE bookings
ALTER COLUMN starttime TYPE TIMESTAMP;
```

3. To make the column Not null, you can use the SET NOT NULL command:

```sql
ALTER TABLE bookings
ALTER COLUMN starttime SET NOT NULL;
```

Please note that these commands are for PostgreSQL. The exact syntax might vary depending on the SQL dialect you are using. Also, please make sure to backup your data before making these changes, as they can potentially result in data loss.

Write a query to change the datatype of the column starttime to datetime in the table 'bookings' and make it as Not null column.Refer the existing DDL of table below.Existing DDL

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