In this case, each column value was entered by the user into a text form field.
在该例中,每个列的值都在由用户输入的文本表单字段中。
Treating numerical values as text yields incorrect results, especially if those values are signed; therefore, the column text must be converted to a numerical type.
将数字作为文本对待会产生错误结果,尤其是当这些值是有符号数字时,因此,列文本必须转换为数字类型。
NULL values in a column can be replaced by user-defined text using the NULL text option.
可以使用NULL TEXT选项将一个列中的null值替换为用户定义的文本。
应用推荐