1. oracle
select * from table1 where rownum<=n
2. informix
select first n * from table1 where 1=1
3. db2
select * row_number() over(order by col1 desc) as rownum where rownum<=n
或者select column from table where 1=1 fetch first n rows only
4. sql server
select top n * from table1 where 1=1
orset rowcount n select * from table1 where 1=1 set rowcount n1
5. sybase
set rowcount n select * from table1 where 1=1 set rowcount n1
6. mysql
select * from table1 where 1=1 limit n
7. foxpro
select * top n from table order by column
8. access
select top n * from table1 where 1=1
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