l4wtgu03_0030

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3.3 Virtual Columns in Table

Virtual columns are columns that do not actually exist in the database table, but are dynamically derived from "real" columns in the same table.
Virtual Column Definition

3.3.1 Virtual Column Name
3.3.2 Virtual Column Type
3.3.3 Virtual Column Sequence

3.3.4 Derive value when record is read
3.3.5 Populate real column when writing to table

Also See

3.3.6 Date Conversion
3.3.7 Substring
3.3.8 Concatenation

3.3.9 Mathematical Calculations
3.3.10 Code Fragment
3.6 Predetermined Join Column (PJC) Definitions
3.2 Real Columns in Table

3.10 Virtual Derivation
Virtual Column Development in the Developer Guide.
Columns in Table Tab in the User Guide.

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3.3 Virtual Columns in Table