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How to Generate A Random Char In Oracle?

2 minutes read

To generate a random char in Oracle, you can use the ASCII function along with the DBMS_RANDOM package. First, use the DBMS_RANDOM package to generate a random number within the ASCII range for characters (65 to 122). Then, Convert this random number to a character using the CHR function. Here is an example query that generates a random character in Oracle:


SELECT CHR(FLOOR(DBMS_RANDOM.VALUE(65, 122))) AS random_char FROM dual;


What is the syntax for generating a random char in Oracle?

In Oracle, you can generate a random character using the following SQL query:

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SELECT CHR(65 + FLOOR(DBMS_RANDOM.VALUE(0,26))) AS random_char
FROM DUAL;


This query generates a random uppercase letter by adding 65 to a random number between 0 and 26 generated by the DBMS_RANDOM.VALUE function. The CHR function then converts this number to its corresponding ASCII character.


What is the best practice for generating random chars in Oracle for security purposes?

The best practice for generating random characters in Oracle for security purposes is to use the DBMS_RANDOM package. This package provides a set of functions that can be used to generate random values, including characters.


One common method to generate random characters is to use the DBMS_RANDOM.STRING function, which generates a random string of specified length. For example, to generate a random string of 10 characters, you can use the following query:

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SELECT DBMS_RANDOM.STRING('A', 10) FROM DUAL;


This will generate a random string of 10 characters, using uppercase letters only. You can modify the function parameters to include other characters, such as numbers or special characters, as needed to increase the randomness of the generated characters.


It is important to note that the DBMS_RANDOM package does not provide true randomness, but rather pseudo-randomness. For stronger security purposes, you may consider using external cryptographic libraries or services to generate random characters.


What is the output format of the random char generated in Oracle?

The random char generated in Oracle is in the form of a single character string.


What is the function in Oracle for generating a random character?

In Oracle, the function for generating a random character is DBMS_RANDOM.STRING. This function can be used to generate a random alphanumeric character or a character from a specified set of characters. Here is an example of how to use this function:

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SELECT DBMS_RANDOM.STRING('x', 1) AS random_char
FROM dual;


In this example, the function DBMS_RANDOM.STRING is used to generate a random character ('x' specifies that the character should be alphanumeric) and the result is selected from the dual table.

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