1. Oracle數據庫
  SELECT * FROM TABLE1 WHERE ROWNUM<=N
2. Infomix數據庫
  SELECT FIRST N * FROM TABLE1
3. DB2數據庫
  SELECT * ROW_NUMBER() OVER(ORDER BY COL1 DESC) AS ROWNUM WHERE ROWNUM<=N
    或者
  SELECT COLUMN FROM TABLE FETCH FIRST N ROWS ONLY
4. SQL Server數據庫
  SELECT TOP N * FROM TABLE1
  
5. Sybase數據庫
  SET ROWCOUNT N 
   GO 
  SELECT * FROM TABLE1
6. MySQL數據庫
  SELECT * FROM TABLE1 LIMIT N
7. FoxPro數據庫
  SELECT * TOP N FROM TABLE ORDER BY COLUMN
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