The error message "ORA-00902: invalid datatype" indicates that you're trying to use a datatype that doesn't exist or isn't supported in Oracle.

The command you're trying to execute is `alter table USERS add key(Email)`. This command seems to be MySQL syntax, not Oracle. In Oracle, you don't use the `key` keyword to create an index on a column.

Instead, you should use the `create index` command. Here's an example:

```sql
CREATE INDEX index_name
ON table_name (column_name);
```

So, in your case, the command should look like this:

```sql
CREATE INDEX email_index
ON USERS (Email);
```

This command will create an index on the `Email` column of the `USERS` table. Please replace `index_name` and `email_index` with the actual index name you want to use.

Question

The error message "ORA-00902: invalid datatype" indicates that you're trying to use a datatype that doesn't exist or isn't supported in Oracle.

The command you're trying to execute is `alter table USERS add key(Email)`. This command seems to be MySQL syntax, not Oracle. In Oracle, you don't use the `key` keyword to create an index on a column.

Instead, you should use the `create index` command. Here's an example:

```sql
CREATE INDEX index_name
ON table_name (column_name);
```

So, in your case, the command should look like this:

```sql
CREATE INDEX email_index
ON USERS (Email);
```

This command will create an index on the `Email` column of the `USERS` table. Please replace `index_name` and `email_index` with the actual index name you want to use.

Knowee AI · Accepted Answer

The error message "ORA-00902: invalid datatype" indicates that you're trying to use a datatype that doesn't exist or isn't supported in Oracle.

The command you're trying to execute is `alter table USERS add key(Email)`. This command seems to be MySQL syntax, not Oracle. In Oracle, you don't use the `key` keyword to create an index on a column.

Instead, you should use the `create index` command. Here's an example:

```sql
CREATE INDEX index_name
ON table_name (column_name);
```

So, in your case, the command should look like this:

```sql
CREATE INDEX email_index
ON USERS (Email);
```

This command will create an index on the `Email` column of the `USERS` table. Please replace `index_name` and `email_index` with the actual index name you want to use.

Error starting at line : 9 File @ /oracle.sqlIn command -alter table USERS add key(Email)Error report -ORA-00902: invalid datatype00902. 00000 - "invalid datatype"Cause: Action:

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Error starting at line : 9 File @ /oracle.sqlIn command -alter table USERS add key(Email)Error report -ORA-00902: invalid datatype00902. 00000 - "invalid datatype"*Cause: *Action:

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Error starting at line : 9 File @ /oracle.sqlIn command -alter table USERS add key(Email)Error report -ORA-00902: invalid datatype00902. 00000 - "invalid datatype"Cause: Action: