CAST 或 CONVERT 函数进行数据类型转换。将字符串转换为整数：，，``sql，SELECT CAST('123' AS UNSIGNED);，-或者，SELECT CONVERT('123', UNSIGNED);，`，，将日期转换为字符串：，，`sql，SELECT CAST(NOW() AS CHAR);，-或者，SELECT CONVERT(NOW(), CHAR);，``CAST 或 CONVERT 函数进行数据类型转换。将字符串转换为整数：，，``sql，SELECT CAST('123' AS UNSIGNED);，-或者，SELECT CONVERT('123', UNSIGNED);，`，，将日期转换为字符串：，，`sql，SELECT CAST(NOW() AS CHAR);，-或者，SELECT CONVERT(NOW(), CHAR);，``Powered By Z-BlogPHP 1.7.3