Table: `ndb.relativeages`#

Description#

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

Statistics#

Metric	Value
Row Count	815
Total Size	216 kB
Table Size	88 kB
Indexes Size	96 kB

Relationships#

Primary Key: relativeageid

Foreign Keys:

relativeagescaleid → relativeagescales.relativeagescaleid
relativeageunitid → relativeageunits.relativeageunitid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`relativeageid`	integer	✗	`nextval('ndb.seq_relativeag...`	PRIMARY KEY	An arbitrary Relative Age identification number.
`relativeageunitid`	integer	✗	`-`	FOREIGN KEY	Relative Age Unit (e.g. «Marine isotope stage», «Land mammal age»). Field links to the RelativeAgeUnits lookup table.
`relativeagescaleid`	integer	✗	`-`	FOREIGN KEY	Relative Age Scale (e.g. «Geologic time scale», «Marine isotope stages»). Field links to the RelativeAgeScales lookup table.
`relativeage`	character varying(64)	✗	`-`	-	Relative Age (e.g. «Rancholabrean», a land mammal age; «MIS 11», marine isotope stage 11).
`c14ageyounger`	double precision	✓	`-`	-	Younger age of the Relative Age unit in 14C yr B.P. Applies only to Relative Age units within the radiocarbon time scale.
`c14ageolder`	double precision	✓	`-`	-	Older age of the Relative Age unit in 14C yr B.P. Applies only to Relative Age units within the radiocarbon time scale.
`calageyounger`	double precision	✓	`-`	-	Younger age of the Relative Age unit in calendar years.
`calageolder`	double precision	✓	`-`	-	Older age of the Relative age unit in calendar years.
`notes`	text	✓	`-`	-	Free form notes or comments about Relative Age unit.
`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 relativeages
SELECT *
FROM relativeages
ORDER BY relativeageid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from relativeages

Example 2: Count Records#

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

Purpose: Get the total number of records in relativeages

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from relativeages within a specific date range

Example 4: Join with relativeagescales#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM relativeages t1
INNER JOIN relativeagescales t2 
    ON t1.relativeagescaleid = t2.relativeagescaleid
LIMIT 100;

Purpose: Retrieve relativeages records with related data from relativeagescales

Example 5: Aggregate Data#

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

Purpose: Count records grouped by relativeageunitid

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.relativeages#