Special considerations for LIKE

Here are some special considerations for using LIKE.

When host variables are used in place of string constants in a search pattern, you should consider using varying length host variables. This allows you to:
- Assign previously used string constants to host variables without any change.
- Obtain the same selection criteria and results as if a string constant was used.
When fixed-length host variables are used in place of string constants in a search pattern, you should ensure that the value specified in the host variable matches the pattern previously used by the string constants. All characters in a host variable that are not assigned a value are initialized with a blank.
For example, if you did a search using the string pattern 'ABC%' in a varying length host variable, these are some of the values that can be returned:
```
'ABCD      '  'ABCDE'    'ABCxxx'      'ABC '
```
However, if you did a search using the search pattern 'ABC%' contained in a host variable with a fixed length of 10, these are some the values that can be returned assuming the column has a length of 12:
```
'ABCDE       ' 'ABCD        ' 'ABCxxx      ' 'ABC         '
```
Note that all returned values start with 'ABC' and end with at least six blanks. This is because the last six characters in the host variable were not assigned a specific value so blanks were used.

If you wanted to do a search using a fixed-length host variable where the last 7 characters can be anything, search for 'ABC%%%%%%%'. These are some values that can be returned:
```
'ABCDEFGHIJ'   'ABCXXXXXXX'  'ABCDE'      'ABCDD'
```