![]() Previously, and in all versions of MySQL, no warnings are triggered since they did erroneously behave as a number: SELECT CAST ( 0 xAA AS UNSIGNED ), CAST ( x 'aa' AS UNSIGNED ), CAST ( X 'aa' AS UNSIGNED ) + -+-+-+ | CAST ( 0 xAA AS UNSIGNED ) | CAST ( x 'aa' AS UNSIGNED ) | CAST ( X 'aa' AS UNSIGNED ) | + -+-+-+ | 170 | 0 | 0 | + -+-+-+ 1 row in set, 2 warnings ( 0. Using CAST() to order an ENUM field as a CHAR rather than the internal numerical value: CREATE TABLE enum_list ( enum_field enum ( 'c', 'a', 'b' )) INSERT INTO enum_list ( enum_field ) VALUES ( 'c' ),( 'a' ),( 'c' ),( 'b' ) SELECT * FROM enum_list ORDER BY enum_field + -+ | enum_field | + -+ | c | | c | | a | | b | + -+ SELECT * FROM enum_list ORDER BY CAST ( enum_field AS CHAR ) + -+ | enum_field | + -+ | a | | b | | c | | c | + -+įrom MariaDB 5.5.31, the following will trigger warnings, since x'aa' and 'X'aa' no longer behave as a number. If you also want to change the collation, you have to use the COLLATE operator: SELECT COLLATION ( CAST ( 123 AS CHAR CHARACTER SET utf8 ) COLLATE utf8_unicode_ci ) + -+ | COLLATION ( CAST ( 123 AS CHAR CHARACTER SET utf8 ) COLLATE utf8_unicode_ci ) | + -+ | utf8_unicode_ci | + -+ ![]() SELECT COLLATION ( CAST ( 123 AS CHAR )) + -+ | COLLATION ( CAST ( 123 AS CHAR )) | + -+ | latin1_swedish_ci | + -+ SELECT COLLATION ( CAST ( 123 AS CHAR CHARACTER SET utf8 )) + -+ | COLLATION ( CAST ( 123 AS CHAR CHARACTER SET utf8 )) | + -+ | utf8_general_ci | + -+ ![]() When used with CHAR CHARACTER SET, the default collation for that character set will be used. Note that when one casts to CHAR without specifying the character set, the collation_connection character set collation will be used. converts the integer constant 42 to type float8 by. Simple casts: SELECT CAST ( "abc" AS BINARY ) SELECT CAST ( "1" AS UNSIGNED INTEGER ) SELECT CAST ( 123 AS CHAR CHARACTER SET utf8 ) A cast specifies how to perform a conversion between two data types. This introduced an incompatibility with previous versions of MariaDB, and all versions of MySQL (see the example below). In 5.5.31 it was intentionally changed to behave as a string in all contexts (and never as a number). Until MariaDB 5.5.31, X'HHHH', the standard SQL syntax for binary string literals, erroneously worked in the same way as 0xHHHH. In MariaDB 10.4 and later, you can use the CAST() function with the INTERVAL keyword. The main difference between CAST and CONVERT() is that CONVERT(expr,type) is ODBC syntax while CAST(expr as type) and CONVERT(. The problem is obviously related to data type but I am unsure what is causing it or how to fix it. After parsing them all some of the values between 0 and 1 are being set to an integer rather than a numeric as cast. VARCHAR (in Oracle mode, from MariaDB 10.3) I have field that has up to 9 comma separated values each of which have a string value and a numeric value separated by colon.The type can be one of the following values: The CAST() function takes a value of one type and produces a value of another type, similar to the CONVERT() function.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |