关于 CONCAT 和 DATE 以及 Have 子句 SQL 的问题

Question

I practicing writing SQL queries, I'm working with a baseball database. The table I'm concerned with is named people with attributes nameFist, nameLast, debute_date, and final_game.

I'm attempting to find the first name and last name (as one field) and debut date of people whose final game was 10,000 days after their debut. Order by the date difference.

So far I have:

SELECT CONCAT(nameFirst,'',nameLast) as name, debut_date FROM PEOPLE;

How would I find the people whose final game was 10,000 days after their debut? debute_date and final_game is formatted like so: Year-Month-Day ei 2014-02-28.

I can't just simply add 10,000 days to final_game.

Answer 1

You can try using the DATEDIFF function. So the query would look something like this:

SELECT CONCAT(nameFirst,' ',nameLast) as name, debut_date
FROM PEOPLE
WHERE DATEDIFF(final_game, debut_date) > 10000
ORDER BY DATEDIFF(final_game, debut_date);

The DATEDIFF function may vary depending on if you are using MySQL or SQL SERVER.

For SQL SERVER, the query might look like this:

SELECT CONCAT(nameFirst,' ',nameLast) as name, debut_date
FROM PEOPLE
WHERE DATEDIFF(d, debut_date, final_game) > 10000
ORDER BY DATEDIFF(d, debut_date, final_game);