SQL | Advanced Functions

Following are some of the advanced functions defined in SQL:

1. BIN(): It converts a decimal number to a binary number.
   Syntax:

   SELECT BIN(18);
   

   Output:
   

2. BINARY(): It converts a value to a binary string
   Syntax:

   SELECT BINARY "GeeksforGeeks";

   Output:
   

3. COALESCE(): It returns the first non-null expression in a list.
   Syntax:

   SELECT COALESCE(NULL,NULL,'GeeksforGeeks',NULL,'Geeks');
   

   Output:
   

4. CONNECTION_ID(): It returns the unique connection ID for the current connection.
   Syntax:
   
   
   
   

   SELECT CONNECTION_ID();
   

   Output:
   

5. CURRENT_USER(): It returns the user name and host name for the MySQL account used by the server to authenticate the current client.
   Syntax:

   SELECT CURRENT_USER();
   

   Output:
   

6. DATABASE(): It returns the name of the default database.
   Syntax:

   SELECT DATABASE();
   

   Output:
   

7. IF(): It returns one value if a condition is TRUE, or another value if a condition is FALSE.
   Syntax:

   SELECT IF(200<500, "YES", "NO");
   

   Output:
   

8. LAST_INSERT_ID(): It returns the first AUTO_INCREMENT value that was set by the most recent INSERT or UPDATE statement.
   Syntax:

   SELECT LAST_INSERT_ID();
   

   Output:
   

9. NULLIF(): It returns the first expression if the two expressions are not equal. If the expressions are equal, NULLIF returns a null value of the type of the first expression.
   • Syntax:

     SELECT NULLIF(25.11, 25);
     

     Output:
     

   • Syntax:

     SELECT NULLIF(115, 115);
     

     Output:
     

10. SESSION_USER(): It returns the user name and host name for the current MySQL user.
    Syntax:

    SELECT SESSION_USER();

    Output:
    

11. SYSTEM_USER(): It returns the user name and host name for the current MySQL user.
    Syntax:

    SELECT SYSTEM_USER();
    

    Output:
    

12. USER(): It returns the user name and host name for the current MySQL user.
    Syntax:

    SELECT USER();
    

    Output:
    

13. VERSION(): It returns the version of the MySQL database.
    Syntax:

    SELECT VERSION();
    

    Output:
    

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