CAST(expr AS type), CONVERT(expr,type), CONVERT(expr USING transcoding_name) : CAST « Cast Functions Operators « MySQL Tutorial

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MySQL Tutorial » Cast Functions Operators » CAST

17. 3. 1. CAST(expr AS type), CONVERT(expr,type), CONVERT(expr USING transcoding_name)

The CAST() and CONVERT() functions take a value of one type and produce a value of another type.

The type can be one of the following values:

BINARY[(N)]
CHAR[(N)]
DATE
DATETIME
DECIMAL
SIGNED [INTEGER]
TIME
UNSIGNED [INTEGER]

CONVERT() with USING is used to convert data between different character sets.

17. 3. CAST
	17. 3. 1.	CAST(expr AS type), CONVERT(expr,type), CONVERT(expr USING transcoding_name)
	17. 3. 2.	Converting the string 'abc' in the default character set to the corresponding string in the utf8 character set:
	17. 3. 3.	Convert blob column to char type
	17. 3. 4.	The cast functions are useful when you want to create a column with a specific type in a CREATE ... SELECT statement:
	17. 3. 5.	CAST() is useful for sorting ENUM columns in lexical order.
	17. 3. 6.	CAST() also changes the result if you use it as part of a more complex expression such as CONCAT('Date: ',CAST(NOW() AS DATE)).
	17. 3. 7.	SELECT CAST(1 AS UNSIGNED) - 2.0;

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