Table: `ndb.chroncontroltypes`#

Description#

Lookup table of Chronology Control Types. This table is referenced by the ChronControls 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 Chronology Control Types. This table is referenced by the ChronControls table.

Statistics#

Metric	Value
Row Count	106
Total Size	32 kB
Table Size	16 kB
Indexes Size	16 kB

Relationships#

Primary Key: chroncontroltypeid

Foreign Keys:

higherchroncontroltypeid → chroncontroltypes.chroncontroltypeid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints	Description
`chroncontroltypeid`	integer	✗	`nextval('ndb.seq_chroncontr...`	PRIMARY KEY, FOREIGN KEY	An arbitrary Chronology Control Type identification number.
`chroncontroltype`	character varying(64)	✓	`-`	-	The Chronology Control Type. Chronology Controls include such geophysical controls as radiocarbon dates, calibrated radiocarbon dates, averages of several radiocarbon dates, potassium-argon dates, and thermoluminescence dates, as well as biostratigraphic controls, sediment stratigraphic controls, volcanic tephras, archaeological cultural associations, and any other types of age controls.
`higherchroncontroltypeid`	integer	✓	`-`	-
`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 chroncontroltypes
SELECT *
FROM chroncontroltypes
ORDER BY chroncontroltypeid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from chroncontroltypes

Example 2: Count Records#

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

Purpose: Get the total number of records in chroncontroltypes

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from chroncontroltypes within a specific date range

Example 4: Join with chroncontroltypes#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM chroncontroltypes t1
INNER JOIN chroncontroltypes t2 
    ON t1.higherchroncontroltypeid = t2.chroncontroltypeid
LIMIT 100;

Purpose: Retrieve chroncontroltypes records with related data from chroncontroltypes

Example 5: Aggregate Data#

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

Purpose: Count records grouped by chroncontroltype

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.chroncontroltypes#