Symbols used to represent any value when selecting specific files. In DOS, Windows and Unix, the asterisk (*) represents any collection of characters, and the question mark (?) represents one single character. In SQL, the percent sign (%) and underscore (_) are used for matching text. Note the following examples:
DOS and Windows (case insensitive)
*.gif Files with ".gif" or ".GIF" extensions
a*.gif GIF files beginning with "a" or "A"
boot.* All files named "boot" or "BOOT"
*.d* File extensions starting with "d" or "D"
?abc Files such as 1ABC, 2ABC, etc.
??abc Files such as 10ABC, XXABC, etc.
Windows only (case insensitive)
*t.jpg All JPEG files ending with "T"
Unix only (case sensitive)
*.jpg Files ending in ".jpg"
*.JPG Files ending in ".JPG"
a*.jpg JPEG files starting with "a"
A*.jpg JPEG files starting with "A"
boot.* All files named "boot"
BOOT.* All files named "BOOT"
?abc Files such as 1abc, 2abc, etc.
??ABC Files such as 10ABC, XXABC, etc.
SQL
Good% Names starting with "Good"
_bcd Names starting with any character
followed by "bcd"
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