Table: `ndb.agetypes`#

Description#

Lookup table of Age Types or units. This table is referenced by the Chronologies and Geochronology tables.

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 Age Types or units. This table is referenced by the Chronologies and Geochronology tables.

Statistics#

Metric	Value
Row Count	5
Total Size	24 kB
Table Size	8192 bytes
Indexes Size	16 kB

Relationships#

Primary Key: agetypeid

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
`agetypeid`	integer	✗	`nextval('ndb.seq_agetypes_a...`	PRIMARY KEY	PK: An arbitrary Age Type identification number
`agetype`	character varying(64)	✗	`-`	-	Age type or units:
* Calendar years AD/BC
* Calendar years BP
* Calibrated radiocarbon years BP
* Radiocarbon years BP
* Varve years BP
`precedence`	integer	✓	`-`	-
`shortagetype`	character varying(32)	✓	`-`	-
`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 agetypes
SELECT *
FROM agetypes
ORDER BY agetypeid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from agetypes

Example 2: Count Records#

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

Purpose: Get the total number of records in agetypes

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from agetypes within a specific date range

Example 4: Aggregate Data#

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

Purpose: Count records grouped by agetype

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.agetypes#