七种数据库中Select Top的使用方法 1. Oracle数据库 SELECT * FROM TABLENAME WHERE ROWNUM <= N 2. Infomix数据库 SELECT FIRST N * FROM TABLENAME 3. DB2数据库 SELECT * FROM (SELECT * ROW_NUMBER() OVER({ORDER BY COL1 DESC}) AS ROWNUM FROM TABLENAME) WHERE ROWNUM <= N 或者 SELEC…