SQL Query Questions - Oracle RDBMS SQL

What does this mean?

1. SELECT title || CHR(10) || pubdate FROM books;

CHR() is new to me...

2.  Is below query correct? If no, why?

SELECT DISTINCT customer, DISTINCT order FROM orders;

I will google, but your help wouldn't harm.
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F-J-KAsked:
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Guy Hengel [angelIII / a3]Billing EngineerCommented:
>CHR() is new to me...
CHR(x) returns the string with the character specified by the asci code X passed as argument. character 10 is the newline.

>2.  Is below query correct? If no, why?
no. DISTINCT comes only once, directly after the SELECT.

this would be correct syntax.
SELECT DISTINCT customer, order FROM orders;

however, you need to clarify what exactly the query should do
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F-J-KAuthor Commented:
Thanks. These are answers of multi choice questions
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F-J-KAuthor Commented:
Good
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