当max在其他列上时获取id值

Question

is this the best way to get the id value of the most recent date?

table1
id,entrydate
1,8/23/2012
2,8/24/2012
3,8/23/2012

select id from table1 where entrydate = ( select MAX(entrydate) from table1 )

Answer 1

You already have a good way there. I'd watch out for ties:

select top id from table1 where entrydate = ( select MAX(entrydate) from table1 )

This, of course, assuming you are using SQL Server.

Answer 2

Assuming you're using SQL-Server, you can use ORDER BY and then take one row:

SELECT TOP 1 id
FROM table
ORDER BY entrydate DESC

In MySql it is LIMIT :

SELECT id
FROM table
ORDER BY entrydate DESC
LIMIT 1

In Oracle:

SELECT id
FROM (SELECT id FROM table ORDER BY entrydate DESC) 
WHERE ROWNUM = 1

Answer 3

SELECT id FROM table1 ORDER BY entrydate DESC LIMIT 1

Answer 4

您应该可以执行SELECT id FROM table1 ORDER BY entrydate DESC LIMIT 1

Answer 5

Not exactly, you want to do this:

For SQL Server:

SELECT TOP 1 id, MAX(entrydate) FROM table1 GROUP BY id

For MySQL:

SELECT id, MAX(entrydate) FROM table1 GROUP BY id LIMIT 1