dc
183037c4d3
New Configuration page explaining derived (computed) variables: what they are, how to configure them in MPE_DERIVED, how filtering works, the rules and limits (expressions only, self-contained, read-only, not stored), and the data-exposure and performance notes. New MPE_DERIVED table page, registered in the Table Guide nav.
25 lines
1.2 KiB
Markdown
25 lines
1.2 KiB
Markdown
---
|
|
layout: article
|
|
title: MPE_DERIVED
|
|
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.
|
|
---
|
|
|
|
# MPE_DERIVED
|
|
|
|
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/)
|
|
|
|
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.
|
|
|
|
## Columns
|
|
|
|
- `TX_FROM num`: SCD2 open datetime
|
|
- 🔑 `TX_TO num`: SCD2 close datetime
|
|
- 🔑 `LIBREF char(8)`: The libref of the target table
|
|
- 🔑 `DSN char(32)`: The target table
|
|
- 🔑 `VARIABLE_NM char(32)`: The name of the derived column
|
|
- `VARIABLE_TYPE char(1)`: `C` for character, `N` for numeric
|
|
- `VARIABLE_LENGTH num`: Character length, or numeric length (1-8)
|
|
- `VARIABLE_FORMAT char(32)`: Optional SAS format, eg `DATE9.`
|
|
- `VARIABLE_LOGIC char(4000)`: The SAS expression that produces the value
|
|
- `ACTIVE num`: Set to 1 to apply the variable
|