Oracle 的随机数、随机日期和时间、随机字符串

1. 随机数包


SELECT DBMS_RANDOM.VALUE


FROM DUAL;

2. 在[0..100]范围内取随机数


SELECT TRUNC (DBMS_RANDOM.VALUE (0, 100))


FROM DUAL;

3. 大于字符‘A’的10个字符随机字符串


SELECT DBMS_RANDOM.STRING ('A', 10)


FROM DUAL;

4. 单个小写随机字符


SELECT CHR (ROUND (DBMS_RANDOM.VALUE (97, 122)))


FROM DUAL;

5. 在过去10天内取随机日期


SELECT TO_DATE (TRUNC (DBMS_RANDOM.VALUE (TO_NUMBER (TO_CHAR (SYSDATE - 10,


'J'


)


),


TO_NUMBER (TO_CHAR (SYSDATE, 'J'))


)


),


'J'


)


FROM DUAL;

6. 在过去30分钟内取随机时间


SELECT (SYSDATE - 1 / 24 / 60 * 30) + DBMS_RANDOM.VALUE (1, 1800) / 3600 / 24


FROM DUAL;