Please remove the AS keyword for table alias when using Oracle DB, since it is illegal in Oracle

[auricleau]

Describe the bug
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Have you read the Contributing Guidelines?

Yes

To Reproduce
Steps to reproduce the behavior:

1. User TypeOrm and Oracle
2. Create Entity with relationships
3. Query through graphql

Expected behavior
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Desktop (please complete the following information):

• Node Version [e.g. 14.14.0]
• Nestjs-query Version [e.g. v0.21.0]

Additional context

Since AS keyword for table alias is illegal in Oracle and it can be omitted for most DB, I suggest adding a checking on current DB type, or completely remove the AS keyword.
As far as I can see, this only occurs in relation-query.builder.ts

[smolinari]

Can you show a reference where AS for aliases isn't allowed with Oracle? It's standard SQL.

I found this and it is showing AS is possible.

https://www.oracletutorial.com/oracle-basics/oracle-alias/

Scott