Error: incorrect syntax near the keyword AS

[Mia Archibald]

SELECT mcr2008.st, (SUM(mcr2008.bedsize)-SUM(mcr2007.bedsize))/SUM(mcr2007.bedsize) 
FROM
    (
		(
        SELECT mcrid, st , SUM(bedsize) as bedsize   
		FROM MCRCR_96_to_08 
        WHERE yr=2008
        GROUP BY  mcrid, st  
		) as MCR2008
                               
        INNER JOIN 
                               
		(
        SELECT  mcrid, st, SUM(bedsize)as bedsize
        FROM MCRCR_96_to_08 
        WHERE yr=2007
        GROUP BY  mcrid, st 
        ) as MCR2007        
        
        ON MCR2007.mcrid=MCR2008.mcrid 
	) as A
GROUP BY st;

[gpl]

You dont need the AS keyord when declaring a derived table, also the outer A table means the inner aliases will not be visible, try this

SELECT mcr2008_st, (SUM(mcr2008_bedsize)-SUM(mcr2007_bedsize))/SUM(mcr2007_bedsize)
FROM
    (
        (
        SELECT mcrid as MCR2008_mcrid, st as MCR2008_st , SUM(bedsize) as MCR2008_bedsize
        FROM MCRCR_96_to_08 
        WHERE yr=2008
        GROUP BY  mcrid, st  
        )  MCR2008
 
        INNER JOIN 
 
        (
        SELECT  mcrid as MCR2007_mcrid, st as MCR2007_st, SUM(bedsize)as MCR2007_bedsize
        FROM MCRCR_96_to_08 
        WHERE yr=2007
        GROUP BY  mcrid, st 
        ) MCR2007
 
        ON MCR2007_mcrid=MCR2008_mcrid
    ) A
  GROUP BY MCR2008_st