Introduction to SQL
The wildcard in a WHERE clause is useful when?

An exact match is necessary in a CREATE statement.
An exact match is necessary in a SELECT statement.
An exact match is not possible in a SELECT statement.
An exact match is not possible in a CREATE statement.

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Introduction to SQL
In an SQL SELECT statement querying a single table, according to the SQL-92 standard the asterisk (*) means that:

all records meeting the full criteria are to be returned.
None of these
all columns of the table are to be returned.
all records with even partial criteria met are to be returned.

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Introduction to SQL
What does the following query find?(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'red')MINUS(SELECT DISTINCT r.sidFROM boats b, reserves rWHERE b.bid = r.bidAND b.color = 'green')

Find the sailor IDs of all sailors who have reserved red boats but not green boats
Find the sailor Ids of atmost one sailor who have reserved red boats but not green boats
Find the sailor IDs of at least one sailor who have reserved red boats but not green boats
None of These

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