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A warning banner on both pages, and '(draft)' in the navigation title, so a reader is not surprised when the feature is not in their installed version. Remove both when the release carrying derived variables goes out. mkdocs build passes; the banner and all four images render.
32 lines
1.6 KiB
Markdown
32 lines
1.6 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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!!! warning "Draft - not in a release yet"
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This page describes a feature that is in development. It is published early so
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the wording and the screenshots can be reviewed; the behaviour described here
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ships in the next release.
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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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- 🔑 `VAR_NM char(32)`: The name of the derived column
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- `VAR_DEPS char(4000)`: Every input the expression uses - physical columns and derived variables, space separated
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- `VAR_TYPE char(1)`: `C` for character, `N` for numeric
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- `VAR_LEN num`: Character length, or numeric length (1-8)
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- `VAR_FMT char(32)`: Optional SAS format, eg `DATE9.`
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- `VAR_LABEL char(256)`: Optional label; defaults to `<VAR_NM>=<expression>`
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- `VAR_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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