mysql系列之类似oracle rownum写法

  SELECT * FROM t order by id LIMIT 1;

  SELECT * FROM t where rownum =1 order by id;

  insert into t(id,date) select sys_guid(),sysdate from dual connect by rownum<=10000;

select * from (select id,name from t) where rownum <![CDATA[<=]]> to_number(num);

SELECT 
  * 
FROM
  (SELECT 
    tb.*,
    @rownum := @rownum + 1 AS rownum 
  FROM
    (SELECT 
      id,
      NAME 
    FROM
      t) tb,
    (SELECT 
      @rownum := 0) r) AS t 
WHERE rownum <= CAST(num AS SIGNED INTEGER) ;