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Moderate: Requires basic macro, coding, and interoperability skills.
The description of the Option Compare Database statement in the MicrosoftAccess "User's Guide" is not very clear. The following is the descriptionfrom the guide:
Comparison is based on the characters' relative position according to the sort order specified when the database was created or compacted.
The Option Compare statement can be used to make comparisons based onbinary value, text value, or values that are defined in the Options dialogbox. (To modify the Options dialog box, click Options on the View menu.)
For example, if you use the Option Compare Binary statement, the expression"a" > "Z" would be true, because the ASCII value of "a" is greater than theASCII value of "Z". However, if you use the Option Compare Text statement,the expression would be false, because "Z" comes after "a" in the alphabet.If you use the Option Compare Database statement, the expression will betrue or false depending on the New Database Sort Order setting you selectin the Items box of the Options dialog box.
The Option Compare statement can also affect the results of the Instr()function. For example, the following function finds the first tab characterin a string:
Function FindTab (mystr$) FindTab = InStr(1, mystr$, Chr(9)) End FunctionIf mystr$="1<space>abc<tab>ABC", the InStr() function will return thefollowing results, depending on which Option Compare statement is used: Option Compare Database: 2 Option Compare Text: 6 Option Compare Binary: 6
For another example, the following function returns the position of thefirst uppercase 'c' in the string:
Function FindEm (mystr$) FindEm = InStr(1, mystr$, "C") End Function
If mystr$="1<space>abc<tab>ABC", the function will return the followingresults, depending on which Option Compare statement is used: