MySQL - 如何前面填充邮件代码与“0”？ [英] MySQL - how to front pad zip code with "0"?

问题描述

在我的MySQL InnoDB数据库中，我有脏邮政编码数据，我想清理。

In my MySQL InnoDB database, I have dirty zip code data that I want to clean up.

干净的邮政编码数据是当我有所有5位数邮政编码（例如90210）。

The clean zip code data is when I have all 5 digits for a zip code (e.g. "90210").

但是由于某种原因，我在数据库中发现，对于以0开头的邮政编码，0

But for some reason, I noticed in my database that for zipcodes that start with a "0", the 0 has been dropped.

因此， Holtsville，New York 包含邮政编码 00544 存储在我的数据库中作为 544

So "Holtsville, New York" with zipcode "00544" is stored in my database as "544"

和

Dedham，MA 与邮政编码 02026 存储在我的数据库中为 2026 。

"Dedham, MA" with zipcode "02026" is stored in my database as "2026".

什么SQL可以运行到前面的0到任何长度不是5位数字的邮政编码？意思是，如果邮政编码的长度为3位数字，前面的00。如果邮政编码长度为4位数，则前面只能填0。

What SQL can I run to front pad "0" to any zipcode that is not 5 digits in length? Meaning, if the zipcode is 3 digits in length, front pad "00". If the zipcode is 4 digits in length, front pad just "0".

UPDATE ：

我把邮政编码改为数据类型VARCHAR（5）

I just changed the zipcode to be datatype VARCHAR(5)

推荐答案

而不是数字类型，或者当您从DB加载它时，您的应用程序用零填充。使用php执行此操作的一种方法：

Store your zipcodes as CHAR(5) instead of a numeric type, or have your application pad it with zeroes when you load it from the DB. A way to do it with php:

echo sprintf("%05d", 205); // prints 00205
echo sprintf("%05d", 1492); // prints 01492

或者你可以用MySQL为你填充：

Or you could have MySQL pad it for you:

SELECT LPAD(zip, 5, '0') as zipcode FROM table;

以下是更新和填充所有行的方法：

Here's a way to update and pad all rows:

ALTER TABLE `table` CHANGE `zip` `zip` CHAR(5); #changes type
UPDATE table SET `zip`=LPAD(`zip`, 5, '0'); #pads everything

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