Oracle查询结果只获取一行数据的几种方法

SELECT *
FROM (
    SELECT *
    FROM your_table
    ORDER BY some_column -- 需要有一个排序条件
)
WHERE ROWNUM = 1;

SELECT *
FROM your_table
ORDER BY some_column
FETCH FIRST 1 ROW ONLY;

SELECT *
FROM your_table
WHERE id = (SELECT MIN(id) FROM your_table);

-- 随机获取 10 条数据
SELECT * FROM (SELECT * FROM 表名  ORDER BY SYS_GUID()) WHERE ROWNUM <= 10;
-- 第二种方法
SELECT * FROM (SELECT * FROM 表名  ORDER BY DBMS_RANDOM.RANDOM()) WHERE RONUM <= 10;
SELECT dbms_random.random()*10 random_string   FROM dual;
select (FLOOR(dbms_random.value*999567895678)+1) from dual;
select (FLOOR(dbms_random.value*8)+1)||'00' from dual;
SELECT dbms_random.string('x', 13) random_string   FROM dual;
SELECT lower( dbms_random.string('u', 1) )    FROM dual;
select (FLOOR(dbms_random.value*27)+1) from dual;
SELECT'1001'|| lower(chr((FLOOR(dbms_random.value*15)+65)))||'e',chr(65),chr(80) FROM dual;
SELECT'1001'|| lower(chr((FLOOR(dbms_random.value*15)+65)))||'e' FROM dual