Table: `ndb.externaltaxa`#

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	46,804
Total Size	18 MB
Table Size	2992 kB
Indexes Size	15 MB

Relationships#

Primary Key: taxonid, extdatabaseid, exttaxonid

Foreign Keys:

extdatabaseid → externaldatabases.extdatabaseid
taxonid → taxa.taxonid

Referenced By:

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

Data Dictionary#

Column	Type	Nullable	Default	Constraints
`taxonid`	integer	✗	`-`	PRIMARY KEY, FOREIGN KEY
`extdatabaseid`	integer	✗	`-`	PRIMARY KEY, FOREIGN KEY
`exttaxonid`	character varying(64)	✗	`-`	PRIMARY KEY
`url`	character varying(128)	✓	`-`	-
`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 externaltaxa
SELECT *
FROM externaltaxa
ORDER BY taxonid DESC
LIMIT 10;

Purpose: Retrieve the 10 most recent records from externaltaxa

Example 2: Count Records#

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

Purpose: Get the total number of records in externaltaxa

Example 3: Filter by Date Range#

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

Purpose: Retrieve records from externaltaxa within a specific date range

Example 4: Join with externaldatabases#

-- Join with related table
SELECT 
    t1.*,
    t2.*
FROM externaltaxa t1
INNER JOIN externaldatabases t2 
    ON t1.extdatabaseid = t2.extdatabaseid
LIMIT 100;

Purpose: Retrieve externaltaxa records with related data from externaldatabases

Example 5: Aggregate Data#

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

Purpose: Count records grouped by extdatabaseid

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.externaltaxa#