mysql 有返回带有序数后缀的数字的函数吗?

发布于 2024-08-17 08:00:58 字数 168 浏览 5 评论 0原文

基本上我正在寻找类似的东西

SELECT ordinal(my_number) FROM my_table

会返回,

1st
11th
1071st
...
etc

但最好不使用存储过程

Basically I'm looking for something like

SELECT ordinal(my_number) FROM my_table

which would return

1st
11th
1071st
...
etc

but preferrably without the use of a stored procedure

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评论(5

鹿! 2024-08-24 08:00:58

我不知道内置函数,但它很容易编写:

SELECT
  CONCAT(my_number, CASE
    WHEN my_number%100 BETWEEN 11 AND 13 THEN "th"
    WHEN my_number%10 = 1 THEN "st"
    WHEN my_number%10 = 2 THEN "nd"
    WHEN my_number%10 = 3 THEN "rd"
    ELSE "th"
  END)
FROM my_table;

I don't know of a built-in function but it's pretty easy to write:

SELECT
  CONCAT(my_number, CASE
    WHEN my_number%100 BETWEEN 11 AND 13 THEN "th"
    WHEN my_number%10 = 1 THEN "st"
    WHEN my_number%10 = 2 THEN "nd"
    WHEN my_number%10 = 3 THEN "rd"
    ELSE "th"
  END)
FROM my_table;
空心空情空意 2024-08-24 08:00:58

mysql 不支持这个。无论您从哪种语言获取 mysql 数据,您都必须处理这些字符串。

mysql doesn't have support for this. You'll have to handle the strings in whichever language you are getting the mysql data from.

伴梦长久 2024-08-24 08:00:58

根据 Ken 的代码,自定义 MySQL 函数如下:

DELIMITER $
CREATE FUNCTION ordinal(number BIGINT)
RETURNS VARCHAR(64)
DETERMINISTIC
BEGIN
  DECLARE ord VARCHAR(64);
  SET ord = (SELECT CONCAT(number, CASE
    WHEN number%100 BETWEEN 11 AND 13 THEN "th"
    WHEN number%10 = 1 THEN "st"
    WHEN number%10 = 2 THEN "nd"
    WHEN number%10 = 3 THEN "rd"
    ELSE "th"
  END));
  RETURN ord;
END$
DELIMITER ;

那么它可以用作:

SELECT ordinal(1)  -- 1st
SELECT ordinal(11) -- 11th
SELECT ordinal(21) -- 21st

SELECT ordinal(my_number) FROM my_table

Based on Ken's code, a custom MySQL function would be as follows:

DELIMITER $
CREATE FUNCTION ordinal(number BIGINT)
RETURNS VARCHAR(64)
DETERMINISTIC
BEGIN
  DECLARE ord VARCHAR(64);
  SET ord = (SELECT CONCAT(number, CASE
    WHEN number%100 BETWEEN 11 AND 13 THEN "th"
    WHEN number%10 = 1 THEN "st"
    WHEN number%10 = 2 THEN "nd"
    WHEN number%10 = 3 THEN "rd"
    ELSE "th"
  END));
  RETURN ord;
END$
DELIMITER ;

Then it can be used as:

SELECT ordinal(1)  -- 1st
SELECT ordinal(11) -- 11th
SELECT ordinal(21) -- 21st

SELECT ordinal(my_number) FROM my_table
芸娘子的小脾气 2024-08-24 08:00:58

在 MySQL 中可以使用字符串函数,但它很快就会变得混乱。您最好只用您所使用的语言添加后缀。例如,在 PHP 中你可以这样做:

function ordSuffix($num) {
    if(empty($num) || !is_numeric($num) || $num == 0) return $num;
    $lastNum = substr($num, -1);
    $suffix = 'th';
    if($lastNum == 1 && $num != 11) { $suffix = 'st'; }
    elseif($lastNum == 2 && $num != 12) { $suffix = 'nd'; }
    elseif($lastNum == 3 && $num != 13) { $suffix = 'rd'; }
    return $num.$suffix;
}

echo ordSuffix(4); // 4th
echo ordSuffix(1); // 1st
echo ordSuffix(12); // 12th
echo ordSuffix(1052); // 1052nd

It is possible in MySQL using the string functions but it gets messy real fast. You'd better just do the suffix in the language you're using. For example, in PHP you could do something like this:

function ordSuffix($num) {
    if(empty($num) || !is_numeric($num) || $num == 0) return $num;
    $lastNum = substr($num, -1);
    $suffix = 'th';
    if($lastNum == 1 && $num != 11) { $suffix = 'st'; }
    elseif($lastNum == 2 && $num != 12) { $suffix = 'nd'; }
    elseif($lastNum == 3 && $num != 13) { $suffix = 'rd'; }
    return $num.$suffix;
}

echo ordSuffix(4); // 4th
echo ordSuffix(1); // 1st
echo ordSuffix(12); // 12th
echo ordSuffix(1052); // 1052nd
怎言笑 2024-08-24 08:00:58

我找到了一种对我有用的方法,但它有点像黑客。之所以

DATE_FORMAT(CONCAT('2010-01-', my_number), '%D')

有效,是因为目前我正在查看的数字永远不会超过 25。但它不能很好地概括,所以有人可能会对此感到高兴:

CONCAT(
    IF(my_number % 100 BETWEEN 11 AND 13,
        FLOOR(my_number / 100),
        FLOOR(my_number / 10)),
    DATE_FORMAT(
        CONCAT('2010-01-', 
            IF(my_number % 100 BETWEEN 11 AND 13
                my_number % 100,
                my_number % 10)),
        '%D'))

但这很多工作量只是为了在 Ken 的代码 更简单。

I found a way that works for me but its a bit of a hack

DATE_FORMAT(CONCAT('2010-01-', my_number), '%D')

That works because currently the number I'm looking at never gets above 25. But it doesn't generalize well so someone might be entertained by this:

CONCAT(
    IF(my_number % 100 BETWEEN 11 AND 13,
        FLOOR(my_number / 100),
        FLOOR(my_number / 10)),
    DATE_FORMAT(
        CONCAT('2010-01-', 
            IF(my_number % 100 BETWEEN 11 AND 13
                my_number % 100,
                my_number % 10)),
        '%D'))

But that's a lot of work just to get at the DATE_FORMAT functionality when Ken's code is simpler.

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