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A derived variable can now be built on one with a lower VARIABLE_ORDER, so the pages describe the order column, the ordered rule (replacing the self-contained one) and a chained example.
26 lines
1.3 KiB
Markdown
26 lines
1.3 KiB
Markdown
---
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layout: article
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title: MPE_DERIVED
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description: The MPE_DERIVED table is used to configure computed columns that appear in the EDIT screen and can be filtered on without being stored in the table.
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---
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# MPE_DERIVED
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The MPE_DERIVED table is used to configure derived (computed) variables - columns that are created when a table is loaded into the EDIT screen, so that they can be displayed and filtered on without being stored. More details are available in the [user guide](/derived-variables/)
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The table is itself registered in [MPE_TABLES](/tables/mpe_tables/), so it is maintained through the EDIT screen with the usual review and approve workflow.
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## Columns
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- `TX_FROM num`: SCD2 open datetime
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- 🔑 `TX_TO num`: SCD2 close datetime
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- 🔑 `LIBREF char(8)`: The libref of the target table
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- 🔑 `DSN char(32)`: The target table
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- 🔑 `VARIABLE_NM char(32)`: The name of the derived column
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- `VARIABLE_ORDER num`: Evaluation order; a variable may reference one with a lower order
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- `VARIABLE_TYPE char(1)`: `C` for character, `N` for numeric
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- `VARIABLE_LENGTH num`: Character length, or numeric length (1-8)
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- `VARIABLE_FORMAT char(32)`: Optional SAS format, eg `DATE9.`
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- `VARIABLE_LOGIC char(4000)`: The SAS expression that produces the value
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- `ACTIVE num`: Set to 1 to apply the variable
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