求一SQL语句

[victorji]

table(aa,bb)
假如我想把aa字段的中所有首字母为‘a’的全部更新为‘A’
sql语句如何写

[Rotaxe]

update [table] set aa='A'+ Right(aa,len(aa)-1) where aa like 'a%'

[txlicenhe]

update [table] set aa='A'+ Right(aa,len(aa)-1) where left(aa,1) = 'a'

[solidpanther]

update [table] set aa='A' where aa like 'a%'