Clausole EXTRACT
    EXTRACT
La clausola 
EXTRACT
 estrae una componente di Data/Ora da una colonna di tipo DateTime
.Esempi
      SELECT EXTRACT(DAY FROM Time) AS "Day" FROM ...
SELECT EXTRACT(YEAR FROM Time) AS "Year" FROM ...
SELECT EXTRACT(MONTH FROM Time) AS "Month" FROM ...
SELECT EXTRACT(HOUR FROM Time) AS "Hour" FROM ...
SELECT EXTRACT(MINUTE FROM Time) AS "Minute" FROM ...
SELECT EXTRACT(SECOND FROM Time) AS "Second" FROM ...
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