Description

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Your company’s accounting department hasn’t been doing great work lately, and they’ve been very sloppy when entering information into their database.

The information about each accounting document is stored in a documents table with 2 columns:

• id: the unique id of the document;
• date: the date the document was created, as a string in the format YYYY-MM-DD (of type VARCHAR(10)). Since input has been sloppy, the leading zeros of days and months have sometimes been omitted.

The omission of these leading zeros for days and months in the date column is making operations on the database prone to errors. To minimize the number of errors without changing the table structure, you need to translate all the dates to ISO format YYYY-MM-DD.

Given the documents table, return a table with one column date_iso that contains all the dates from documents sorted by the ids of the corresponding documents.

Example

For the following table documents

id	date_str
1	2000-1-1
2	2014-8-21
3	2002-03-07
4	2008-10-5
5	2016-12-17

the output should be

date_iso
2000-01-01
2014-08-21
2002-03-07
2008-10-05
2016-12-17

• [execution time limit] 10 seconds (mysql)

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/*Please add ; after each select statement*/
CREATE PROCEDURE dateFormatting()
BEGIN
	SELECT Date(date_str) AS date_iso
    FROM documents
    ORDER BY id;
END