Table: `ndb.radiocarbon`#

Description#

No description available in database.

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: No description available

Statistics#

Metric	Value
Row Count	34,080
Total Size	3944 kB
Table Size	2384 kB
Indexes Size	1536 kB

Relationships#

Primary Key: geochronid

Foreign Keys:

geochronid → geochronology.geochronid
radiocarbonmethodid → radiocarbonmethods.radiocarbonmethodid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints
`geochronid`	integer	✗	`-`	FOREIGN KEY, PRIMARY KEY, UNIQUE
`radiocarbonmethodid`	integer	✓	`-`	FOREIGN KEY
`percentc`	double precision	✓	`-`	-
`percentn`	double precision	✓	`-`	-
`delta13c`	double precision	✓	`-`	-
`delta15n`	double precision	✓	`-`	-
`percentcollagen`	double precision	✓	`-`	-
`reservoir`	double precision	✓	`-`	-
`recdatecreated`	timestamp without time zone	✗	`timezone('UTC'::text, now())`	-
`recdatemodified`	timestamp without time zone	✗	`-`	-
`masscmg`	double precision	✓	`-`	-
`cnratio`	double precision	✓	`-`	-

TODO: Review column descriptions and add comments where missing.

Usage Examples#

Example 1: Basic Selection#

-- Get recent records from radiocarbon
SELECT *
FROM radiocarbon
ORDER BY geochronid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from radiocarbon

Example 2: Count Records#

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

Purpose: Get the total number of records in radiocarbon

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from radiocarbon within a specific date range

Example 4: Join with geochronology#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM radiocarbon t1
INNER JOIN geochronology t2 
    ON t1.geochronid = t2.geochronid
LIMIT 100;

Purpose: Retrieve radiocarbon records with related data from geochronology

Example 5: Aggregate Data#

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

Purpose: Count records grouped by radiocarbonmethodid

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.radiocarbon#