SELECT CAST(1 AS UNSIGNED) - 2.0; : CAST « Cast Functions Operators « MySQL Tutorial

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MySQL Tutorial » Cast Functions Operators » CAST

17. 3. 7. SELECT CAST(1 AS UNSIGNED) - 2.0;


mysql>

mysql> SELECT CAST(1 AS UNSIGNED) - 2.0;

+---------------------------+

| CAST(1 AS UNSIGNED) - 2.0 |

+---------------------------+

|                      -1.0 |

+---------------------------+

1 row in set (0.00 sec)



mysql>

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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