本文介绍了在多种数据库中实现获取前N条记录的方法，包括Oracle、Informix、DB2、SQL Server、Sybase、MySQL及FoxPro等。每种数据库采用特定的语法来限制返回结果的数量。
1. ORACLE
SELECT * FROM TABLE1 WHERE ROWNUM<=N
2. INFORMIX
SELECT FIRST N * FROM TABLE1
3. DB2
SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N
DB2
SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY
4. SQL SERVER
SELECT TOP N * FROM TABLE1
5. SYBASE
set rowcount n
go
SELECT * FROM TABLE1
6. mysql:
select * from table_name limit N
7. FOXPRO
select * top N from c:\foxmold\excel order by con_no
SELECT * FROM TABLE1 WHERE ROWNUM<=N
2. INFORMIX
SELECT FIRST N * FROM TABLE1
3. DB2
SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N
DB2
SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY
4. SQL SERVER
SELECT TOP N * FROM TABLE1
5. SYBASE
set rowcount n
go
SELECT * FROM TABLE1
6. mysql:
select * from table_name limit N
7. FOXPRO
select * top N from c:\foxmold\excel order by con_no
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