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[quote manuale]
The CAST() and CONVERT() functions may be used to take a value of one type and produce
a value of another type. Their syntax is:
CAST(expression AS type)
CONVERT(expression,type)
CONVERT(expr USING transcoding_name)
The type value can be one of the following:
² BINARY
² CHAR
² DATE
² DATETIME
² SIGNED {INTEGER}
² TIME
² UNSIGNED {INTEGER}
[/quote]