Oracle: trim, ltrim, and rtrim functions; remove spaces and chars from ends of a string

ltrim: trims a string from the left end.
rtrim: trims a string from the right end.
trim: trims a string from both ends.

By default, they trim the empty spaces away from the ends if you don't specify any particular characters to trim.

For example, you have a string: abcdedcba

      select trim('   abcdedcba ') as st from dual;    or
      select ltrim('   abcdedcba') as st from dual;    or
      select rtrim('abcdedcba   ') as st from dual;    or

       returns :

ST
---------
abcdedcba

To remove the left 'a' of the string:

          select ltrim('abcdedcba', 'a') from dual;

To remove the left 'abc' from the string:

          select ltrim('abcdedcba', 'abc') from dual;
          select ltrim('abcdedcba', 'cba') from dual;
          select ltrim('abcdedcba', 'bca') from dual;

To remove the right 'a' from the string:

          select rtrim('abcdedcba', 'a') from dual;

To remove the right 'ba' from the string:

             select rtrim('abcdedcba', 'ab') from dual;
             select rtrim('abcdedcba', 'ba') from dual;

To remove the 'a' from both ends:

           select trim('abcdedcba', 'a') from dual;

To remove the 'ab' from the left and the 'ba' from the right end:

           select trim('abcdedcba', 'ab') from dual;
           select trim('abcdedcba', 'ba') from dual;

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