MySQL Limit
1)取Top N
SELECT * FROM t LIMIT N;
2)取第M(从0开始)条记录开始的N条记录
SELECT * FROM t LIMIT M,N;
或
SELECT * FROM t LIMIT N OFFSET M;
Oracle ROWNUM
1)取Top N
SELECT * FROM t WHERE ROWNUM<=N;
2)取第M(从0开始)条记录开始的N条记录
SELECT * FROM ( SELECT t.*,ROWNUM num FROM t WHERE ROWNUM<(M+1+N) ) WHERE num>=(M+1);