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Examine this command and some partial output:
Why does the DB01.abc.com service show unknown status?
Table ORDER_ITEMS contains columns ORDER_ID, UNIT_PRICE and QUANTITY, of data type NUMBER.
Examine these SQL statements:
Statement 1:
SELECT MAX(unit_price * quantity) ''Maximum Order''
FROM order_items;
Statement 2:
SELECT MAX(unit_price * quantity) ''Maximum Order''
FROM order_items
GROUP BY order_id;
Which two statements are true?
https://docs.oracle.com/javadb/10.8.3.0/ref/rrefsqlj27781.html
The Expression can contain multiple column references or expressions, but it cannot contain another aggregate or subquery. It must evaluate to a built-in data type. You can therefore call methods that evaluate to built-in data types. (For example, a method that returns a java.lang.Integer or int evaluates to an INTEGER.) If an expression evaluates to NULL, the aggregate skips that value.
Your database instance was shut down normally and then started in NOMOUNT state. You then execute this command:
ALTER DATABASE MOUNT;
Which two actions are performed? (Choose two.)
Which two statements are true about space-saving features in an Oracle Database? (Choose two.)
Which three statements are true about inner and outer joins? (Choose three.)
