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Oracle dbms_random

Introduce several commonly used functions to generate 0-1 decimals (default)

SQL > select dbms_random.valuefrom dual

VALUE

-

. 932351752

Note: the result can be processed by trunc and round functions

Generate a number within the specified range

FUNCTION VALUE RETURNS NUMBER

Argument Name Type In/Out Default?

-

LOW NUMBER IN

HIGH NUMBER IN

SQL > select dbms_random.value (235.48) from dual

DBMS_RANDOM.VALUE (23,048)

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23.1991482

Note: the result can be processed by trunc and round functions

A random number string of length 20

SQL > select length (cast (dbms_random.valueas varchar2 (1024) from dual

LENGTH (CAST (DBMS_RANDOM.VALUEASVARCHAR2 (1024)

thirty-nine

It means that only 38 placeholders have numbers after the decimal point.

SQL > select substr (cast (dbms_random.valueas varchar2 (38)), 3Jing 20) from dual

SUBSTR (CAST (DBMS_RANDOM.VALUEASVARCHAR2)

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52633757378080443317

Random number of normal distribution

Select dbms_random.normal from dual

Random string

Select dbms_random.string (opt, length) fromdual

Available values for opt are as follows:

'upright grammar': uppercase letters

'l 'er': lowercase letters.

'a small letter': upper and lowercase letters

'x numbers, uppercase letters

'pendant dint': printable characters

SQL > select dbms_random.string ('Utopia 10) from dual

DBMS_RANDOM.STRING ('Utopia 10)

- -

DTKOJUGGHI

Summary: random dates and random strings can be realized through dbms_random, and those with random changes can be converted using this function.

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