MySQL支持多种数据类型之间的转换,主要包括: 字符串(CHAR、VARCHAR、TEXT等) 数字(INT、FLOAT、DECIMAL等) 日期/时间(DATE、TIME、DATETIME等) 二进制数据(BINARY、VARBINARY等) 优势 灵活性:CAST函数允许你在查询中动态地转换数据类型,这在处理不同数据源或合并不同数据表时非常有用。
Why not see decimal in output `result` ? Is not sufficient the round syntax? thank you. mysql> SELECT ID, AV, ROUND( CAST( REPLACE (AV, ".", "") AS DECIMAL (10, 2) ), 2 ) AS result FROM tbl_m WHERE ID = 833; +---+---+---+ | ID | av | result | +---+--...
// collation modifier in the CAST(expr, CHAR(...) BINARY) syntax. // To restore old behavior just remove this "if ($3...)" branch. $$.charset= get_bin_collation($3.charset ? $3.charset : YYTHD->variables.collation_connection); if ($$.charset == nullptr) MYSQL_YYABORT; } els...
// collation modifier in the CAST(expr, CHAR(...) BINARY) syntax. // To restore old behavior just remove this "if ($3...)" branch. $$.charset= get_bin_collation($3.charset ? $3.charset : YYTHD->variables.collation_connection); if ($$.charset == nullptr) MYSQL_YYABORT; } els...
BINARY) syntax. // To restore old behavior just remove this "if ($3...)" branch. $$.charset= get_bin_collation($3.charset ? $3.charset : YYTHD->variables.collation_connection); if ($$.charset == nullptr) MYSQL_YYABORT; } else $$.charset= $3.charset; } | nchar opt_...
Syntax error converting the varchar value '12.5' to a column of data type int. (4). 要返回一个合法的数值,就必须使用能处理这个值的数据类型。对于这个例子,存在多个可用的数据类型。如果通过CAST()函数将这个值转换为 decimal类型,需要首先定义decimal值的精度与小数位数。在本例中,精度与小数位数分别为9...
The CAST() function takes an expression of any type and produces a result value of the specified type, similar to CONVERT(). For more information, see the description of CONVERT(). CAST() is standard SQL syntax. 文档创建时间:2018年6月26日15:38:27...
MySQL中的CAST函数用于将一个数据类型转换为另一个数据类型。它允许你在查询中对数据进行类型转换,以便进行比较、计算或其他操作。 语法 代码语言:txt 复制 CAST(expression AS type) expression:要转换的表达式。 type:目标数据类型。 支持的数据类型 BINARY[(N)] ...
Syntax CAST(expr AS type_name) Arguments expr can be an expression in one of the data types. type_name is one of the data types listed in Table1-2,"Dimensional Data Types". Table 3-1 shows which data types can be cast into which other built-in data types. NUMBER includes NUMBER, ...
To convert strings between character sets, you can also useCONVERT(expr,type)syntax (withoutUSING), orCAST(exprAStype), which is equivalent: CONVERT(string,CHAR[(N)]CHARACTERSETcharset_name)CAST(stringASCHAR[(N)]CHARACTERSETcharset_name)