如SQL标准中所述，此函数返回输入字符串的八位字节长度或字节长度。
This function, as mentioned in SQL standard, returns the length of the input string in octets or bytes.
除了输入字符串之外，SUBSTRING函数还有其他三个参数，它们分别是：起始位置、长度和代码单元指定。
Along with the input string, the SUBSTRING function has three other arguments, which are start position, length, and code unit specification.
您可能会感到奇怪。其实内部函数调用将输入字符串转换成使用特定格式编译的时间戳。
In case you're curious, the inner function call converts the input string into a timestamp that complies with a specific format.
如果使用CODEUNITS来获取字符的长度，则用作字符串函数输入的CODEUNITS的不同会导致输出的不同。
If you take the length of a character in CODEUNITS, the output differs according to the CODEUNITS used as inputs to the string function.
字符串函数拥有数值规范，或者说结果是输入数据相关的数值。
The string function has the specification of numeric value, or the result is a numeric value related to the input data.
如果他只是按下了回车，read_line函数将返回一个空字符串，这样的输入会被认为是一种用户希望继续进行检索的暗示。
If he just presses Enter, the read_line function will return an empty string, and such input is taken as an indication that the user wants to go on.
现在，sqlquery函数可以将多个参数作为输入，第一个参数是一个表示全选择的字符串，其后是参数的值。
Now, the sqlquery function can take multiple arguments as input where the first argument is a string value representing a full select followed by the values of the parameters.
与LENGTH函数不同，CHARACTER_LENGTH 只接受基于字符串的输入数据。
Unlike the LENGTH function, the CHARACTER_LENGTH does not accept input data that is not string based.
首先调用内置的input函数来请求用户输入他们的计算，随后input作为一个字符串返回。
First calls the built-in input function to request the user to type in their calculation, which input then returns as a string.
一些函数的输入是数值，比如字符串函数的起始、长度和偏移量参数。
For some functions, a numeric value is input, for example start, length, and offset parameters of string functions.
此示例中的输入是一个简单的字符串，因此将使用字符串填充参数，并将其传递给调用函数。
The input in this example is a simple string, so you populate the argument array with a string and pass it to the invoke function.
字符串函数的输入字符串数据可能拥有源字符串中的一些错误字符或无效字符。
The input string data to string functions may have wrong or invalid characters in the string that it is supplied with.
此函数将一个字符串值作为输入，该字符串是一个有效的SQL全选择语句。
This function takes a string value as input which is a valid SQL full select statement.
字符串变量的长度：substr函数的输入参数，决定了结果字符串的期望长度或length函数的输出。
Length of a string variable: Input argument for the SUBSTR function, which determines the desired length of the resulting string or output of the length function.
在这种情况下，将输入节点与一个名为id的节点相比较，id节点的子文本节点由传递给函数的Name字符串构成。
In this case, you compare the input node against a node named id that has a child text node made of the name string passed in to the function.
应验证函数的每个输入并且应由您的要求来确定如何响应null或空的字符串输入。
Each of the inputs to the function should be validated and your requirements should determine the responses to null or empty string inputs.
arrayconcat函数获取一个字符串数组作为输入并在字符串输出中返回联接后的这些字符串。
The array concat function takes an array of strings as an input and returns a concatenation of the strings into a single string output.
它接收XML数据作为输入，将xml字符串转化成SimpleXMLElement对象，然后发送给该类的另一个(递归)函数作为输入。
It takes XML data as input, and it converts the XML string into a SimpleXMLElement object, which is sent as input to another (recursive) function in this class.
虽然双引号隐式地把数据类型定义为字符串，但是以上方法显式地把concat 2函数的输入和输出类型定义为字符串。
Though the double quotes implicitly types data as strings, the above method explicitly types both the input and output to the concat2 function as strings.
此数据库需要自定义命令字符串才可运行存储过程或函数。请在此处输入文本。
This database requires a custom command string to run stored procedures or functions. Enter the text here.
生成一个新字符串，其字符是将指定的函数应用于输入字符串的每个字符并连接结果字符串的结果。
Builds a new string whose characters are the results of applying a specified function to each of the characters of the input string and concatenating the resulting strings.
编写函数输入一个字符串，将其中的元音字母逆置。
Write a function that takes a string as input and reverse only the vowels of a string.
编写函数输入一个字符串，将其中的元音字母逆置。
Write a function that takes a string as input and reverse only the vowels of a string.
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