-- 查询第一行
-- 不包含排序时
SELECT * FROM TM_PM_PAY WHERE HOSPITAL_CODE = '0002' AND ROWNUM = 1;
-- 包含排序时
SELECT * FROM (SELECT * FROM TM_PM_PAY t WHERE HOSPITAL_CODE = '0002' ORDER BY PAY_NO DESC) WHERE ROWNUM = 1;

-- 查询前10行
SELECT * FROM TM_PM_PAY WHERE ROWNUM <= 10;