Table: `ndb.relativeageunits`#

Description#

Lookup table of RelativeAgeUnits. Table is referenced by the RelativeAges table.

TODO: Expand this description with: - What data does this table store? - What is the business/research purpose? - How is this data collected or generated? - Are there any important caveats or data quality issues?

Table Structure#

Schema: ndb | Table Comment: Lookup table of RelativeAgeUnits. Table is referenced by the RelativeAges table.

Statistics#

Metric	Value
Row Count	15
Total Size	24 kB
Table Size	8192 bytes
Indexes Size	16 kB

Relationships#

Primary Key: relativeageunitid

No foreign key relationships.

Referenced By:

TODO: Document which tables reference this table (will be auto-detected in validation).

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`relativeageunitid`	integer	✗	`nextval('ndb.seq_relativeag...`	PRIMARY KEY	An arbitrary Relative Age Unit identification number.
`relativeageunit`	character varying(64)	✗	`-`	-	Relative Age Unit. Below are the Relative Age Units for the «Geologic time scale» with an example Relative Age.
`recdatecreated`	timestamp without time zone	✗	`timezone('UTC'::text, now())`	-
`recdatemodified`	timestamp without time zone	✗	`-`	-

TODO: Review column descriptions and add comments where missing.

Usage Examples#

Example 1: Basic Selection#

-- Get recent records from relativeageunits
SELECT *
FROM relativeageunits
ORDER BY relativeageunitid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from relativeageunits

Example 2: Count Records#

-- Count total records
SELECT COUNT(*) as total_records
FROM relativeageunits;

Purpose: Get the total number of records in relativeageunits

Example 3: Filter by Date Range#

-- Get records within a date range
SELECT *
FROM relativeageunits
WHERE recdatecreated >= '2024-01-01'
  AND recdatecreated < '2025-01-01'
ORDER BY recdatecreated DESC;

Purpose: Retrieve records from relativeageunits within a specific date range

Example 4: Aggregate Data#

-- Aggregate records by relativeageunit
SELECT 
    relativeageunit,
    COUNT(*) as count
FROM relativeageunits
GROUP BY relativeageunit
ORDER BY count DESC
LIMIT 10;

Purpose: Count records grouped by relativeageunit

TODO: Add more specific examples relevant to common research questions or operational tasks.

Data Quality Notes#

TODO: Document: - Known data quality issues - Validation rules - Expected data ranges - Update frequency and mechanisms - Any ETL processes that populate this table

Maintenance#

Data Owner: TODO: Assign owner
Update Frequency: TODO: Document frequency
Last Major Schema Change: TODO: Document when schema last changed

Table: ndb.relativeageunits#