1. Take the record from the table
Select * from (select * from staff order by dbms_random.random)
WHERE ROWNUM <4
Represents 3 records from the STAFF table
2, generate random number
Select dbms_random.random from dual;
Generate a random number of any size
SELECT ABS (MOD (DBMS_Random.random, 100)) from DUAL;
Generate a random number within a 100
SELECT TRUNC (100 900 * dbms_random.value) from dual;
Generate a random number between 100 ~ 1000
Select dbms_random.value from dual;
Generate a random number between 0 ~ 1
Select dbms_random.value (10, 20) from Dual;
Generate a random number between 10 ~ 20
Select dbms_random.normal from dual;
Normal function returns a set of normal distributions. This normal distribution standard deviation is 1, the expected value is 0. 68% of the value returned by this function is between -1 and 1, 95% between -2 and 2, 99% is between -3 and 3.
3, generate random strings
Select dbms_random.string from dual;
Returns a random string of 60 characters long. (Unsucaching success)
Select dbms_random.string ('p', 20) from DUAL;
The first parameter P represents the Printable, ie the string is composed of any printed characters to indicate the second parameter indicates that the return string length is returned.
