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

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

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Introduction to SQL
Find all the tuples having temperature greater than 'Paris'.

SELECT * FROM weather WHERE temperature > 'Paris' temperature
SELECT * FROM weather WHERE temperature > (SELECT temperature FROM weather WHERE city = 'Paris')
SELECT * FROM weather WHERE temperature > (SELECT * FROM weather WHERE city = 'Paris')
SELECT * FROM weather WHERE temperature > (SELECT city FROM weather WHERE city = 'Paris')

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