Mysql> SELECT CAST(CAST(1-2 AS UNSIGNED) AS SIGNED) To a signed or unsigned 64-bit integer, respectively. UNSIGNED cast operators to cast the operation Operands is an unsigned integer, the result is unsigned. If you are using numeric operators (such as MySQL supports arithmetic with both signed and unsigned 64-bit If you use a number in string context, the number automatically is Normally do not have to do anything other than to use the string To cast a string to a numeric value in numeric context, you You use it as part of a more complex expression such asĮxtract data in different formats but instead use string functions SELECT enum_col FROM tbl_name ORDER BY CAST( enum_col AS CHAR) ĬHAR) treats the expression as a string with the default Occurs using the internal numeric values. The functions also can be useful for sorting The cast functions are useful when you want to create a columnĬREATE TABLE new_table SELECT CAST('' AS DATE) Generally for comparing strings that are represented in different That a case-insensitive collation is used, specify a To use a different character set, substitute its name for SELECT 'A' LIKE CONVERT( blob_col USING latin1) FROM tbl_name To perform a case-insensitive comparison, use the Value or other binary string in case-insensitive fashion becauseīinary strings have no character set, and thus no concept of The default character set to the corresponding string in the This statement converts the string 'abc' in Same as the corresponding character set names. The non- USING form ofĭifferent character sets. If the optional lengthīytes of the argument. VARBINARY Types” for a description of how Of one type and produce a value of another type. Value of one type and produce a value of another type, similar Note that in some contexts, if you cast an indexed column toīINARY, MySQL is not able to use the index The entire operation it can be given before either operand Sensitive even if the column isn't defined as This is an easy way toįorce a column comparison to be done byte by byte rather thanĬharacter by character. We could change our example above to convert the value '' to the latin1 character set as follows: mysql> SELECT CONVERT('techonthenet.String following it to a binary string. This CONVERT example takes the value '' and converts it from the current character set to the utf8 character set. For example: mysql> SELECT CONVERT('' USING utf8) Let's look at how to use the CONVERT function to convert between character sets. The second syntax for the MySQL CONVERT function allows you to convert a value from one character set to another. This CONVERT example takes the value '4' and converts it as a BINARY datatype with the binary string value of '4'. For example: mysql> SELECT CONVERT('4', BINARY) This CONVERT function example shows how to convert a value to a BINARY type. This CONVERT example takes the value 4-5 and converts it as an UNSIGNED datatype with the value of 18446744073709551614. For example: mysql> SELECT CONVERT(4-6, UNSIGNED) This CONVERT function example shows how to convert a value to an UNSIGNED type. This CONVERT example takes the value 4-5 and converts it as a SIGNED datatype with the value of -2. For example: mysql> SELECT CONVERT(4-6, SIGNED) This CONVERT function example shows how to convert a value to a SIGNED type. This CONVERT example takes the value 125 and converts it as a CHAR datatype with the value of '125'. For example: mysql> SELECT CONVERT(125, CHAR) This CONVERT function example shows how to convert a value to a CHAR type. This CONVERT example takes the value '08:14:57' and converts it to a TIME datatype. For example: mysql> SELECT CONVERT('08:14:57', TIME) This CONVERT function example shows how to convert a value to a TIME type. This CONVERT example takes the value ' 08:14:57' and converts it to a DATETIME datatype. For example: mysql> SELECT CONVERT(' 08:14:57', DATETIME) This CONVERT function example shows how to convert a value to a DATETIME type. This CONVERT example takes the value '' and converts it to a DATE datatype. For example: mysql> SELECT CONVERT('', DATE) Let's look at how to use the CONVERT function to convert a value to a DATE type. The first syntax for the MySQL CONVERT function allows you to convert a value from one datatype to another datatype. Let's look at some MySQL CONVERT function examples and explore how to use the CONVERT function in MySQL.
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