Index on Expressions Sample

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File: ...\Samples\Solution\Db\Index2.scx

This index sample shows several options you might consider when using a character field to represent a Unique ID (one often comprised of numeric data). An index tag based on a character field will sort based on the ASCII values of the data whereas a numeric expression, using the VAL(В ) function, will sort on numeric sequences. The following table shows the sort difference of two indexes:

cExpression VAL(cExpression)

1

1

11

2

2

11

Note:
When you use the VAL(В ) function, all non-numeric values will be converted to 0.

By incorporating the BINTOC(В ) function, you also can reduce the size of your index tags considerably.

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