PostgreSQL MD5 

Introduction to PostgreSQL MD5 Function

PostgreSQL MD5 function is used to convert a string into 32 character text string in PostgreSQL; It is used in a critical application where data security is a major concern. MD5 is a cryptographic hash function used to generate a 32 character text string, a text hexadecimal value representation of a checksum of 128 bit. MD5 algorithm in PostgreSQL designed in 128 bit it is encryption algorithm in PostgreSQL designed to convert a string into 32 character text string. MD5 function is very useful and important in PostgreSQL.

Syntax:

• Md5 (string (Any character string that we want to convert into 32 character text string ))
• Select column_name1, md5 (Column_name2 (Column name that we have used to convert string into 32 character text string)), md5(column_name3(Column name that we have used to convert string into 32 character text string)), .., Column_nameN from table_name;
• Select MD5 (‘String’);

Parameters of PostgreSQL MD5

Below is the parameter description of the above syntax are as follows:

1. MD5: MD5 is a cryptographic hash function used to generate a 32 character text string, a text hexadecimal value representation of a checksum of 128 bit. MD5 function is very useful and important in PostgreSQL.
2. String: Any character string that we want to convert into 32 character text string in PostgreSQL. We can use any string to convert a string into a 32-bit text string.
3. Select: Select is used to select any character string to convert into 32 character text string in PostgreSQL.
4. Column 1 to Column N: Column name used to convert the data into text string in PostgreSQL.We can convert character data type column data into 32 character text string.
5. Table Name: Table name used to display the data from a specified table in PostgreSQL.

How PostgreSQL MD5 Function Works?

• MD5 function in PostgreSQL accepts the one string or argument as an input string while converting a string into a text string.
• It is used in critical applications where the security of data is a major concern.
• MD5 function is very useful and important in PostgreSQL.
• This function is used to convert a string into 32 character text string in PostgreSQL.
• We can use an MD5 function at the time of user creation to provide an encrypted password for the user in PostgreSQL.
• MD5 function will consider every word as a string in PostgreSQL. It will work only on a string, not for the integer value.
• The below example shows that it will consider every string as a character, not an integer value. To convert a string into a text string, we need to define a string in a single quote.

select MD5 (10);

select MD5 ('10');

• In the above first example, we have passed 10 values without a single quote; passing this value will show an error that the MD5 function did not exist.
• But when we pass the 10 value in a single quote, it will display the 32 character string.
• MD5 function is not work in integer data type data. In the below example data type, while we have to display emp_id of integer types, it will not display the data; it will show an error.

select MD5 (emp_id) from Employee limit 2;

select MD5 (emp_name) from Employee limit 2;

• In the above figure first example, we have retrieved data from integer data type column same time it will show an error. But when we have retrieved data from the character data type, it will not issue an error; it will display the result in 32 character string in text format.

Examples to Implement MD5 Function in PostgreSQL

• Below is the example of MD5 function in PostgreSQL is as follows.
• We have using the employee table to describe the example of MD5 function in PostgreSQL is as follows.

select * from employee;

Figure: Example of an employee table to describe the example of MD5 function in PostgreSQL.

1. Convert single string into 32 bit String

Below is the example of converting a single string into a 32-bit character text string in PostgreSQL. In the below example, we have to convert the ABC string into a 32-bit character text string.

select MD5 ('ABC');

In above example ABC string will return “902fbdd2b1df0c4f70b4a5d23525e932” string using a MD5 function in PostgreSQL.

2. Convert Table Data

The below example show to convert a character string into 32 Bit text string in PostgreSQL.

SELECT emp_id, md5 (emp_name), md5 (emp_address), emp_phone, emp_salary, date_of_joining FROM employee;

In the above example, we have to convert an emp_name and emp_address column in 32 string text format using md5 functions in PostgreSQL.

3. MD5 Function using UUID

The below example shows how the UUID function works using an MD5 function in PostgreSQL.

SELECT md5('MD5 String')::uuid;

Advantages of PostgreSQL MD5

• MD5 function in PostgreSQL used to convert a string into 32 character text string.
• MD5 function is used in a critical function where data security is a major concern. MD5 function is essential in PostgreSQL.
• MD5 function is used to convert a character string into a text string.
• We can use the MD5 function to store user password in text format.
• We used the MD5 function for data security and privacy in a critical application.

Conclusion

MD5 function is used to convert a string into 32 character text string; it’s used in a critical application where security is a major concern. MD5 is a cryptographic hash function used to generate a 32 character text string, a text hexadecimal value representation of a checksum of 128 bit.

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